Imerslund-Grasbeck syndrome

description: Imerslund-Grasbeck syndrome (IGS) or selective vitamin B12 (cobalamin) malabsorption with proteinuria is a rare autosomal recessive disorder characterized by vitamin B12 deficiency commonly resulting in megaloblastic anemia, which is responsive to parenteral vitamin B12 therapy and appears in childhood.


peroneus tertius muscle, absence of

category: biolink:Disease biolink:DiseaseOrPhenotypicFeature biolink:BiologicalEntity biolink:ThingWithTaxon biolink:NamedThing


d-bifunctional protein deficiency

description: A genetic disorder that affects the ability of the body to effectively break down fat from our diet. It is typically characterized by hypotonia (low muscle tone) and seizures in the newborn period. Other symptoms include unusual facial features and an enlarged liver (hepatomegaly). Most babies with this condition nevergain anydevelopmental skills and do not survive past the age of 2. DBP deficiency is caused by mutations in the HSD17B4 gene and is inherited in an autosomal recessive manner. Some researchers have suggested classifying DBP deficiency into three subtypes, depending on how severely the mutation in the HSD17B4 gene affects the function of the gene and the protein that it codes for. Almost all individuals with types I, II, and III have similar signs and symptoms. A fourth subtype has additionally been proposed for individuals that have less severe symptoms. While there is no cure for DBP deficiency, treatment is focused on improving nutrition and growth, controlling symptoms, and limiting the progression of liver disease.


Peters plus syndrome

description: An autosomal recessively inherited syndromic developmental defect of the eye characterized by a variable phenotype including Peters anomaly and other anterior chamber eye anomalies, short limbs, limb abnormalities (i.e. rhizomelia and brachydactyly), characteristic facial features (upper lip with cupid bow, short palpebral fissures), cleft lip/palate, and mild to severe developmental delay/intellectual disability. Other associated abnormalities reported in some patients include congenital heart defects (i.e. hypoplastic left heart, absence of right pulmonary vein, bicuspid pulmonary valve), genitourinary anomalies (hydronephrosis, renal hypoplasia, renal and ureteral duplication, multicystic dysplastic kidneys, glomerulocystic kidneys) and congenital hypothyroidism.


persistent Mullerian duct syndrome

description: Persistent Mullerian duct syndrome (PMDS) is a rare disorder of sex development (DSD) characterized by the persistence of Müllerian derivatives, the uterus and/or fallopian tubes, in otherwise normally virilized boys.


Pfeiffer-Palm-Teller syndrome

description: Pfeiffer-Palm-Teller syndrome is a very rare dysmorphic syndrome described in two sibs and characterized by a short stature, unique facies, enamel hypoplasia, progressive joint stiffness, high-pitched voice, cup-shaped ears, and narrow palpebral fissures with epicanthal folds, and intellectual deficit.


PHAVER syndrome

description: Phaver syndrome is a very rare syndrome characterized by the association of limb Pterygia, Heart anomalies, Autosomal recessive inheritance, Vertebral defects, Ear anomalies and Radial defects.


phenylketonuria

description: Phenylketonuria (PKU) is the most common inborn error of amino acid metabolism and is characterized by mild to severe mental disability in untreated patients.


dihydropteridine reductase deficiency

description: Dihydropteridine reductase (DHPR) deficiency is a severe form of hyperphenylalaninemia (HPA) due to impaired regeneration of tetrahydrobiopterin (BH4), leading to decreased levels of neurotransmitters (dopamine, serotonin) and folate in cerebrospinal fluid, and causing neurological symptoms such as psychomotor delay, hypotonia, seizures, abnormal movements, hypersalivation, and swallowing difficulties.


BH4-deficient hyperphenylalaninemia A

description: An autosomal recessive condition caused by mutation(s) in the PTS gene, encoding 6-pyruvoyl tetrahydrobiopterin synthase. It is characterized by BH4-defecient hyperphenylalanemia, depletion of dopamine and serotonin, and progressive cognitive and motor deficits.


name: phosphoenolpyruvate carboxykinase deficiency, mitochondrial


name: glycogen storage disease due to phosphoglycerate mutase deficiency

description: A rare, autosomal recessive, inherited disorder caused by mutation of the PGAM2 gene. It is characterized by non-spherocytic hemolytic anemia, exercise-induced cramping, myoglobinuria, and presence of tubular aggregates on muscle biopsy.


name: phosphoenolpyruvate carboxykinase deficiency, cytosolic

description: PEPCK1 deficiency is a rare inborn error of metabolism disorder, characterized by the deficiency of the enzyme PEPCK1, one of the enzymes needed for gluconeogenesis, the process by which organisms produce sugars (namely glucose) from non-carbohydrate precursors (such as amino acids). The symptoms described in the few cases reported in the medical literature suggest that there may be variation in the severity of the symptoms ranging from severe early-onset cases, to milder late-onset presentations. In severe cases symptoms may include persistent and very low levels of blood's sugar in newborns (neonatal hypoglycemia), failure to thrive, build-up of lactic acid in the blood (lactic acidosis), liver enlargement (hepatomegaly) and liver failure leading to neurological degeneration. Milder cases present during childhood with fewer and less serious liver problems. Infections and fasting may trigger the symptoms. PEPCK1 deficiency inheritance is autosomal recessive. It is caused by mutations in the PEPCK1 gene. Some researchers believe that the severity of the disease depend upon the mutations resulting in less or more PEPCK1 activity (the more active the enzyme is, the less severe the disease is, and vice versa). Treatment depend on the symptoms and may include giving extra carbohydrates during heavy exercise and illness or other times of fasting (formal sick day regimen) by the dietitian.PEPCK1 is the cytosolic form of the phosphoenolpyruvate carboxykinase (PEPCK) enzyme, the other being the mitochondrial (PEPCK2).


name: lethal congenital glycogen storage disease of heart

description: Any glycogen storage disease in which the cause of the disease is a mutation in the PRKAG2 gene.


glycogen storage disease IXb

description: A disorder of glycogen metabolism caused by a deficiency in liver and muscle phosphorylase kinase subunit b, is autosomal recessive and can lead to hepatomegaly, hypoglycemia after prolonged fasting, and growth retardation.


isolated Pierre-Robin syndrome

description: Pierre-Robin syndrome (or Pierre-Robin sequence) is characterized by triad of orofacial morphological anomalies consisting of retrognathism, glossoptosis and a posterior median velopalatal cleft.


pili torti

description: Pili torti is a hair shaft abnormality characterized by flat hair that is twisted at irregular intervals. Hair is normal at birth but progressively stops growing long and becomes fragile. Pili torti can be isolated or occur in association with syndromes such as Menkes disease or Bazex syndrome.


name: pili torti-developmental delay-neurological abnormalities syndrome

description: Pili torti-developmental delay-neurological abnormalities syndrome is characterized by growth and developmental delay, mild to moderate neurologic abnormalities, and pili torti. It has been described in a brother and his sister born to consanguineous Puerto Rican parents.


Bjornstad syndrome

description: Bjrnstad syndrome is characterized by congenital sensorineural hearing loss and pili torti. Less than fifty cases have been reported so far. The hearing loss usually becomes evident very early in life, often in the first year. Pili torti, a condition in which the hair shaft is flattened and twisted, makes the hair very brittle and patients develop hair loss in the first two years of life. Bjrnstad syndrome is transmitted as an autosomal recessive condition. It is caused by mutations in the BCS1L gene. Mutations in this gene also cause GRACILE syndrome.


name: pilodental dysplasia-refractive errors syndrome

description: Pilodental dysplasia-refractive errors syndrome is a rare ectodermal dysplasia syndrome characterized by dysplastic abnormalities of the hair and teeth (including hypodontia, abnormally shaped teeth, scalp hypotrichosis and pili annulati), follicular hyperkeratosis on the trunk and limbs, and hyperopia. Intensified delineation, reticular hyperpigmentation of the nape and astigmatism have also been reported. There have been no further descriptions in the literature since 1985.


Rabson-Mendenhall syndrome

description: Rabson-Mendenhall syndrome belongs to the group of extreme insulin-resistance syndromes (which also includes leprechaunism, the lipodystrophies, and the type A and B insulin resistance syndromes).


achromatopsia 3

description: Any achromatopsia in which the cause of the disease is a mutation in the CNGB3 gene.


name: isolated growth hormone deficiency type IA

description: An isolated growth hormone deficiency characterized by autosomal recessive inheritance of severe dwarfism with onset by 6 months of age and variable development of antibodies to growth hormone following exogenous supplementation that has material basis in null mutations in the GH1 gene on chromosome 17q23.3.


Laron syndrome

description: Laron syndrome is a congenital disorder characterized by marked short stature associated with normal or high serum growth hormone (GH) and low serum insulin-like growth factor-1 (IGF-I) levels which fail to rise after exogenous GH administration.


name: pituitary hormone deficiency, combined, 2

description: Any combined pituitary hormone deficiencies, genetic form in which the cause of the disease is a mutation in the PROP1 gene.


name: short stature due to growth hormone qualitative anomaly

description: Short stature due to growth hormone qualitative anomaly is characterized by growth retardation and short stature (despite the presence of normal or slightly elevated levels of immunoreactive growth hormone, GH), low concentrations of insulin-like growth factor-I (IGF-I) and a significant increase in growth rate following recombinant GH therapy. Prevalence is unknown but only a few cases have been reported in the literature. The syndrome is caused by various mutations in the GH1 gene (17q22-q24) that result in structural GH anomalies and a biologically inactive molecule. Transmission is autosomal recessive.


name: short stature-pituitary and cerebellar defects-small sella turcica syndrome

description: Short stature-pituitary and cerebellar defects-small sella turcica syndrome is characterized by short stature, anterior pituitary hormone deficiency, small sella turcica, and a hypoplastic anterior hypophysis associated with pointed cerebellar tonsils. It has been described in three generations of a large French kindred. Ectopia of the posterior hypophysis was observed in some patients. The syndrome is transmitted as a dominantly inherited trait and is caused by a germline mutation within the LIM-homeobox transcription factor LHX4 gene (1q25).


name: pituitary dwarfism with large sella turcica


name: plasma clot retraction factor, deficiency of


alpha-2-plasmin inhibitor deficiency

description: Congenital alpha2 antiplasmin deficiency is a rare hemorrhagic disorder caused by congenital deficiency of alpha2 antiplasmin, leading to dysregulated fibrinolysis and is characterized by a hemorrhagic tendency presenting from childhood with prolonged bleeding and ecchymoses following minor trauma and spontaneous bleeding episodes (often in unusual locations like diaphysis of long bones). Congenital alpha2 antiplasmin deficiency is inherited in an autosomal recessive manner.


Scott syndrome

description: Scott syndrome is an extremely rare congenital hemorrhagic disorder characterized by hemorrhagic episodes due to impaired platelet coagulant activity.


desquamative interstitial pneumonia

description: A rare idiopathic interstitial pneumonia characterized by accumulation of macrophages in alveolar spaces and interstitial inflammation. It usually occurs in smokers. Some patients develop progressive interstitial lung fibrosis.


name: polycystic kidney, cataract, and congenital blindness


name: autosomal recessive polycystic kidney disease

description: An inherited disorder characterized by the development of cysts affecting the collecting ducts. It is frequently associated with hepatic involvement.


acquired polycythemia vera

description: Polycythemia vera (PV) is an acquired myeloproliferative disorder characterized by an elevated absolute red blood cell mass caused by uncontrolled red blood cell production, frequently associated with uncontrolled white blood cell and platelet production.


Chuvash polycythemia

description: Chuvash erythrocytosis is a rare, genetic, congenital secondary polycythemia disorder characterized by increased hemoglobin, hematocrit and erythropoietin serum levels and normal oxygen affinity, which usually manifests with headache, dizziness, dyspnea and/or plethora. Patients present an increased risk of hemorrhage, thrombosis and early death.


name: short-rib thoracic dysplasia 6 with or without polydactyly

description: A group of rare, autosomal recessive inherited disorders characterized by a constricted thoracic cage, short ribs, and a 'trident' appearance of the acetabular roof. Polydactyly may or may not be present. Other abnormalities include cleft lip and palate and abnormalities of the brain, eye, heart, liver, pancreas, intestine, kidney, and genitalia.


name: postaxial polydactyly-dental and vertebral anomalies syndrome

description: Postaxial polydactyly-dental and vertebral anomalies syndrome is a rare, genetic, developmental defect during embryogenesis syndrome characterized by postaxial polydactyly and other abnormalities of the hands and feet (e.g. brachydactyly, broad toes), hypoplasia and fusion of the vertebral bodies, as well as dental abnormalities (fused teeth, macrodontia, hypodontia, short roots). There have been no further descriptions in the literature since 1977.


adult polyglucosan body disease

description: Adult polyglucosan body disease (APBD) is a glycogen storage disease of adults characterized by progressive upper and lower motor neuron dysfunction, progressive neurogenic bladder and cognitive difficulties that can lead to dementia.


description: Polysyndactyly-cardiac malformation syndrome is characterized by polysyndactyly, hexadactyly (duplication of the first toe) and complex cardiac malformation (including atrial and ventricular septal defect, single ventricle, aortic dextroposition, or dilation of the right heart). It has been described in six patients from three unrelated families. Other manifestations were present in some patients (i.e. facial dysmorphism, hepatic cysts).


Bartsocas-Papas syndrome 1

description: A rare, inherited, popliteal pterygium syndrome characterized by severe popliteal webbing, microcephaly, a typical face with short palpebral fissures, ankyloblepharon, hypoplastic nose, filiform bands between the jaws and facial clefts, oligosyndactyly, genital abnormalities, and additional ectodermal anomalies (i.e. absent hair, eyebrows, lashes, nails). It is often fatal in the neonatal period, but patients living until childhood have been reported.


cutaneous porphyria

description: Congenital erythropoietic porphyria, or Günther disease, is a form of erythropoietic porphyria characterized by very severe and mutilating photodermatosis.


postaxial acrofacial dysostosis

description: Postaxial acrofacial dysostosis (POADS) is a type of acrofacial dysostosis characterized by mandibular and malar hypoplasia, small and cup-shaped ears, lower lid ectropion, and symmetrical postaxial limb deficiencies with absence of the fifth digital ray and ulnar hypoplasia.


Gitelman syndrome

description: Gitelman syndrome (GS), also referred to as familial hypokalemia-hypomagnesemia, is characterized by hypokalemic metabolic alkalosis in combination with significant hypomagnesemia and low urinary calcium excretion.


urban-Rogers-Meyer syndrome

description: This syndrome is characterized by intellectual deficit, short stature, obesity, genital abnormalities, and hand and/or toe contractures. It has been described in two brothers and in one isolated case. The patients also present with generalized osteoporosis and a history of frequent fractures. This syndrome is similar to Prader-Willi syndrome, but the hand contractures and osteoporosis, together with the lack of hypotonia, indicate this is a different entity.


name: pterin-4 alpha-carbinolamine dehydratase 1 deficiency

description: Pterin-4 alpha-carbinolamine dehydratase 1 (PCBD1) deficiency is considered a transient and benign form of hyperphenylalaninemia due to tetrahydrobiopterin deficiency, characterized by muscular hypotonia, irritability (detected by EEG), slow acquisition of psychomotor skills, age-dependent movement disorders, including dystonia and an accompanying excretion of 7-substituted pterins. Neurological development is normal with dietary control of blood phenyalanine. PCBD1 is inherited in an autosomal recessive manner.


Wiedemann-Rautenstrauch syndrome

description: Wiedemann-Rautenstrauch syndrome is a very rare disorder with features of premature aging recognizable at birth, decreased subcutaneous fat, hypotrichosis, relative macrocephaly and dysmorphism.


prolactin deficiency, isolated

description: Subnormal concentration of prolactin.


name: prolactin deficiency with obesity and enlarged testes


name: prune belly syndrome with pulmonic stenosis, intellectual disability, and deafness


pseudodiastrophic dysplasia

description: Pseudodiastrophic dysplasia is characterized by rhizomelic shortening of the limbs and severe clubfoot deformity, in association with elbow and proximal interphalangeal joint dislocations, platyspondyly, and scoliosis. It has been described in about 10 patients. An autosomal recessive inheritance has been suggested. Pseudodiastrophic dysplasia differs from diastrophic dysplasia on the basis of clinical, radiographic, and histopathologic findings. Clubfoot can be treated by surgical therapy, and neonatal contractures and scoliosis can be relieved by physical therapy. Several of the reported patients died in the neonatal period or during infancy.


name: 46,XX disorder of sex development-skeletal anomalies syndrome


name: 46,XY disorder of sex development due to 17-beta-hydroxysteroid dehydrogenase 3 deficiency

description: Decreased activity of the steroidogenic enzyme, 17-beta-hydroxysteroid dehydrogenase, associated with mutation(s) in the HSD17B3 gene, leading to reduced testosterone production.


name: autosomal recessive pseudohypoaldosteronism type 1

description: Generalized pseudohypoaldosteronism type 1 (generalized PHA1) is a severe form of primary mineralocorticoid resistance with systemic involvement and salt loss in multiple organs.


name: fundus dystrophy, pseudoinflammatory, recessive form


peroxisomal acyl-CoA oxidase deficiency

description: Peroxisomal acyl-CoA oxidase deficiency is a rare neurodegenerative disorder that belongs to the group of inherited peroxisomal disorders and is characterized by hypotonia and seizures in the neonatal period and neurological regression in early infancy.


Acrootoocular syndrome

description: Acro-oto-ocular syndrome is a very rare disorder associating pseudopapilledema (optic disk swelling not secondary to increased intracranial pressure), mixed hearing loss, facial dysmorphism and limb extremity anomalies.


description: Holoprosencephaly-postaxial polydactyly syndrome associates, in chromosomally normal neonates, holoprosencephaly, severe facial dysmorphism, postaxial polydactyly and other congenital abnormalities, suggestive of trisomy 13.


name: 46,XY disorder of sex development due to 5-alpha-reductase 2 deficiency

description: A rare disorder of sex development (DSD) due to a defect in metabolizing testosterone to dihydrotestosterone and characterized by incomplete intrauterine masculinization which ranges from a female genitalia with a blind vaginal pouch to a fully male phenotype with pseudovaginal posterior hypospadias and micropenis.


vitamin D-dependent rickets, type 1

description: Hypocalcemic vitamin D-dependent rickets (VDDR-I) is an early-onset hereditary vitamin D metabolism disorder characterized by severe hypocalcemia leading to osteomalacia and rachitic bone deformations, and moderate hypophosphatemia.


name: autosomal recessive inherited pseudoxanthoma elasticum

description: An autosomal recessive form of PXE.


name: autosomal recessive multiple pterygium syndrome

description: A rare congenital disorder, this is the non-lethal variant of multiple pterygium syndrome, characterized by orthopedic and craniofacial abnormalities, pterygium and akinethesia. The majority of cases are autosomal dominant.


3MC syndrome 2

description: Any 3MC syndrome in which the cause of the disease is a mutation in the COLEC11 gene.


pulmonary alveolar microlithiasis

description: Pulmonary alveolar microlithiasis is a disorder in which tiny fragments (microliths) of calcium phosphate gradually accumulate in the small air sacs (alveoli) of the lungs. These deposits eventually cause widespread damage to the alveoli and surrounding lung tissue (interstitial lung disease). People with this disorder may also develop a persistent cough and difficulty breathing (dyspnea), especially during physical exertion. Chest pain that worsens when coughing, sneezing, or taking deep breaths is another common feature. People with pulmonary alveolar microlithiasismay also develop calcium phosphate deposits in other organs and tissue of the body. Though the course of the disease can be variable,many casesslowly progress to lung fibrosis, respiratory failure, or cor pulmonale. The only effective therapy is lung transplantation. In some cases, pulmonary alveolar microlithiasis is caused by mutations in the SLC34A2 gene and inherited in an autosomal recessive manner.


name: surfactant metabolism dysfunction, pulmonary, 1

description: An autosomal recessive condition caused by mutation(s) in the SFTPB gene, encoding pulmonary surfactant-associated protein B. It is characterized by severe respiratory distress-like illness and responds poorly to exogenous administration of surfactant.


name: pulmonary atresia-intact ventricular septum syndrome

description: Pulmonary atresia with intact ventricular septum (PA-IVS) is a rare form of cyanotic congenital heart malformation characterized by severe cyanosis and tachypnea. PA-IVS presents significant morphologic diversity: at the end of the spectrum are patients with a mildly hypoplastic and tripartite right ventricle (RV) and mild tricuspid valve (TV) hypoplasia, and at the other end are patients with severe RV and TV hypoplasia, often with RV-dependent coronary circulation.


congenital pulmonary lymphangiectasia

description: Congenital pulmonary lymphangiectasia (PL) is a rare developmental disorder involving the lung and characterized by pulmonary subpleural, interlobar, perivascular, and peribronchial lymphatic dilatation.


name: alveolar capillary dysplasia with misalignment of pulmonary veins

description: A rare and fatal developmental lung disease characterized by respiratory distress in neonates due to refractory hypoxemia and severe pulmonary arterial hypertension.


name: pulmonary hypertension, primary, autosomal recessive


familial primary pulmonary hypoplasia

description: Primary pulmonary hypoplasia is a rare, isolated, genetic developmental defect during embryogenesis characterized by congential malformation of pulmonary parenchyma with absence of other anomalies. Neonatally patients present with decreased breath sounds, small lung volume and severe respiratory distress that is not responsive to aggressive treatment (including surfactant instillation/ mechanical respiratory support). It is usually not compatible with life.


pulmonary venoocclusive disease

description: A disorder characterized by pulmonary venous constriction or occlusion, resulting in pulmonary hypertension.


name: pulmonic stenosis and congenital nephrosis


pycnodysostosis

description: Pycnodysostosis is a genetic lysosomal disease characterized by short stature, increased density of the bones (osteosclerosis/osteopetrosis), and brittle bones. Other features may include underdevelopment of the tips of the fingers with absent or small nails, an abnormal collarbone (clavicle), distinctive facial features including a large head with a small face and chin, underdeveloped facial bones, a high forehead, and dental abnormalities.Pycnodysostosis is an autosomal recessive condition caused by mutations in the gene that codes the enzyme cathepsin K (CTSK) on chromosome 1q21. The diagnosis of pycnodysostosis is based on physical features and X-ray findings. Molecular genetic testing is available. Treatment should address the symptoms found in each patient and may include orthopedic monitoring, treatment of fractures, appropriate dental care, and craniofacial surgery.


pyknoachondrogenesis

description: Pyknoachondrogenesis is a lethal skeletal osteochondrodysplasia characterized by severe generalized osteosclerosis.


Pyle disease

description: A bone dysplasia characterized by genu valgum, metaphyseal anomalies with broadening of the long bones extending into the diaphyses and giving the femora and tibiae an 'Erlenmeyer flask'' appearance, widening of the ribs and clavicles, platyspondyly and cortical thinning.


pyridoxine-dependent epilepsy

description: A rare neurometabolic disease characterized by recurrent intractable seizures in the prenatal, neonatal and postnatal period that are resistant to anti-epileptic drugs (AEDs) but that are responsive to pharmacological dosages of pyridoxine (vitamin B6).


name: hemolytic anemia due to pyrimidine 5' nucleotidase deficiency

description: Hemolytic anemia due to pyrimidine 5' nucleotidase deficiency is a rare, hereditary, hemolytic anemia due to an erythrocyte nucleotide metabolism disorder characterized by mild to moderate hemolytic anemia associated with basophilic stippling and the accumulation of high concentrations of pyrimidine nucleotides within the erythrocyte. Patients present with variable features of jaundice, splenomegaly, hepatomegaly, gallstones, and sometimes require transfusions. Rare cases of mild development delay and learning difficulties are reported.


name: glutathione synthetase deficiency with 5-oxoprolinuria


pyropoikilocytosis, hereditary

description: An autosomal recessive inherited severe hemolytic anemia. It is a subtype of hereditary elliptocytosis and is characterized by partial spectrin deficiency.


pyruvate carboxylase deficiency disease

description: Pyruvate carboxylase (PC) deficiency is a rare neurometabolic disorder characterized by metabolic acidosis, failure to thrive, developmental delay, and recurrent seizures at an early age in severely affected patients.


pyruvate kinase deficiency of red cells

description: Hemolytic anemia due to red cell pyruvate kinase (PK) deficiency is a metabolic disorder characterized by a variable degree of chronic nonspherocytic hemolytic anemia.


name: radioulnar synostosis-developmental delay-hypotonia syndrome

description: Radioulnar synostosis-developmental delay-hypotonia syndrome, also known as Der Kaloustian-McIntosh-Silver syndrome, is an extremely rare syndrome with synostosis described in about 4 patients to date with clinical manifestations including congenital unilateral radioulnar synostosis, generalized hypotonia, developmental delay, and dysmorphic facial features (long face, prominent nose and ears).


leukocyte adhesion deficiency type II

description: Leukocyte adhesion deficiency type II (LAD-II) is a form of LAD characterized by recurrent bacterial infections, severe growth delay and severe intellectual deficit.


rapadilino syndrome

description: RAPADILINO syndrome is a syndrome for which the acronym indicates the principal signs: RA for radial ray defect, PA for both patellae hypoplasia or aplasia and cleft or highly arched palate, DI for diarrhea and dislocated joints, LI for little size and limb malformations, NO for long, slender nose and normal intelligence.


adult Refsum disease

description: A very rare, clinically variable, multisystemic metabolic disease, characterized by anosmia, early-onset retinitis pigmentosa and possible neurological manifestations, including neuropathy, and cerebellar ataxia, deafness, ichthyosis, skeletal abnormalities, and cardiac arrhythmia. It is characterized biochemically by accumulation of phytanic acid in plasma and tissues.


peroxisome biogenesis disorder type 3B

description: A genetic disorder characterized by abnormalities in the breakdown of phytanic acid. It results in accumulation of phytanic acid in the blood, brain and other tissues. Signs and symptoms include retinitis pigmentosa which may lead to blindness, hearing problems and deafness, hypotonia, ataxia, nystagmus, facial deformities, and mental and growth retardation.


inflammatory bowel disease 1

description: Any inflammatory bowel disease in which the cause of the disease is a mutation in the NOD2 gene.


Senior-Loken syndrome 1

description: Any Senior-Loken syndrome in which the cause of the disease is a mutation in the NPHP1 gene.


Ulbright-Hodes syndrome

description: Ulbright-Hodes syndrome is characterized by renal dysplasia, growth retardation, phocomelia or mesomelia, radiohumeral fusion, rib abnormalities, anomalies of the external genitalia and a potter-like facies. The syndrome has been described in three infants (one pair of sibs and an unrelated case), all of whom died shortly after birth from respiratory distress resulting from pulmonary hypoplasia and oligohydramnios caused by renal dysplasia. The mode of transmission appears to be autosomal recessive.


name: short-rib thoracic dysplasia 9 with or without polydactyly

description: An asphyxiating thoracic dystrophy that has material basis in homozygous or compound heterozygous mutation in the IFT140 gene on chromosome 16p13.


Perlman syndrome

description: Perlman syndrome is characterized principally by polyhydramnios, neonatal macrosomia, bilateral renal tumors (hamartomas with or without nephroblastomatosis), hypertrophy of the islets of Langerhans and facial dysmorphism.


name: renal tubular acidosis, distal, 2, with progressive sensorineural hearing loss


name: renal tubular dysgenesis of genetic origin

description: An instance of renal tubular dysgenesis that is caused by a modification of the individual's genome.


name: respiratory distress syndrome in premature infants

description: Infant acute respiratory distress syndrome is a lung disorder that affects premature infants caused by developmental insufficiency of surfactant production and structural immaturity of the lungs. The symptoms usually appear shortly after birth and may include tachypnea, tachycardia, chest wall retractions (recession), expiratory grunting, nasal flaring and cyanosis during breathing efforts.


name: respiratory underresponsiveness to hypoxia and hypercapnia


reticular dysgenesis

description: Reticular dysgenesis is the most severe form of severe combined immunodeficiency (SCID) and is characterized by bilateral sensorineural deafness and a lack of innate and adaptive immune functions leading to fatal septicemia within days after birth if not treated.


name: familial hemophagocytic lymphohistiocytosis type 1

description: Familial Hemophagocytic lymphohistiocytosis (FHL) is a rare primary immunodeficiency characterized by a macrophage activation syndrome with an onset usually occurring within a few months or less common several years after birth.


reticulum cell sarcoma

description: An antiquated term that refers to a non-Hodgkin lymphoma composed of diffuse infiltrates of large, often anaplastic lymphocytes.


description: Retinal degeneration-nanophthalmos-glaucoma syndrome is characterized by progressive pigmentary retinal degeneration (with nyctalopia and visual field restriction), cystic macular degeneration and angle closure glaucoma. It has been described in seven members of one family. Patients also have hyperopia and nanophthalmos. The mode of transmission is autosomal recessive.


name: reticular dystrophy of the retinal pigment epithelium

description: Reticular dystrophy of the retinal pigment epithelium is a patterned dystrophy of the retinal pigment epithelium, of progressive course, characterized by the presence of a bilateral hyperpigmented reticular pattern resembling a fishnet with knots, resulting in a slowly progressive loss of vision that often only becomes apparent in old age. Reticular dystrophy of the retinal pigment epithelium is sometimes associated with scleral staphyloma, choroidal neovascularization, convergent strabismus, spherophakia with myopia and luxated lenses, and partial atrophy of the iris.


name: retinal telangiectasia and hypogammaglobulinemia


name: retinitis pigmentosa inversa with deafness


name: retinitis pigmentosa-intellectual disability-deafness-hypogenitalism syndrome

description: Retinitis pigmentosa - intellectual disability - deafness - hypogenitalism is an extremely rare syndromic retinitis pigmentosa characterized by pigmentary retinopathy, diabetes mellitus with hyperinsulinism, acanthosis nigricans, secondary cataracts, neurogenic deafness, short stature mild hypogonadism in males and polycystic ovaries with oligomenorrhea in females. Inheritance is thought to be autosomal recessive. It can be distinguished from Alstrom syndrome by the presence of intellectual disability and the absence of renal insufficiency. There have been no further descriptions in the literature since 1993.


late-adult onset retinitis pigmentosa

description: A retinitis pigmentosa that is characterized by onset of symptoms in the fifth or sixth decade of life.


retinohepatoendocrinologic syndrome

description: Retinohepatoendocrinologic syndrome is characterized by total colorblindness caused by progressive cone dystrophy, degenerative liver disease, and endocrine dysfunction (hypothyroidism, diabetes, repeated abortions or infertility). It has been described in six females from two sibships with a high degree of consanguinity, and in a male from another family.


name: retinopathy, pigmentary, and intellectual disability


name: autosomal recessive pericentral pigmentary retinopathy

description: A retinitis pigmentosa that is characterized autosomal recessive inheritance of pigmentary retinal degeneration with onset in the infancy but slower rates of progression than other forms of retinopathy.


Revesz syndrome

description: Revesz syndrome is a rare severe phenotypic variant of dyskeratosis congenita (DC) with an onset in early childhood, characterized by features of DC (e.g. skin hyper/hypopigmentation, nail dystrophy, oral leukoplakia, high risk of bone marrow failure (BMF) and cancer, developmental delay sparse and fine hair) in conjunction with bilateral exudative retinopathy, and intracranial calcifications.


name: myoglobinuria, acute recurrent, autosomal recessive


embryonal rhabdomyosarcoma

description: A poorly circumscribed morphologic variant of rhabdomyosarcoma. It is characterized by the presence of primitive skeletal muscle differentiation in any stage of myogenesis.


alveolar rhabdomyosarcoma

description: A rapidly growing malignant mesenchymal neoplasm. It is characterized by the presence of round cells with myoblastic differentiation and a fibrovascular stroma resembling an alveolar growth pattern. The tumor usually presents in the extremities.


rhizomelic syndrome, Urbach type

description: Rhizomelic syndrome, Urbach type is a rare primary bone dysplasia characterized by upper limbs rhizomelia and other skeletal anomalies (e.g. short stature, dislocated hips, digitalization of the thumb with bifid distal phalanx), craniofacial features (e.g. microcephaly, large anterior fontanelle, fine and sparse scalp hair, depressed nasal bridge, high arched palate, micrognathia, short neck), congenital heart defects (e.g. pulmonary stenosis), delayed psychomotor development and mild flexion contractures of elbows. Radiologic evaluation may reveal flared epiphyses, platyspondyly and/or digital anomalies.


Richieri Costa-Pereira syndrome

description: Richieri Costa-Pereira syndrome is characterized by short stature, Robin sequence, cleft mandible, pre/postaxial hand anomalies (including hypoplastic thumbs), and clubfoot. It has been described in 14 Brazilian families and in one unrelated French patient. Prominent low set ears and a highly arched palate were also observed. Transmission is autosomal recessive.


autosomal recessive Robinow syndrome

description: Autosomal recessive Robinow syndrome (RRS) is the less common type of Robinow syndrome (RS) characterized by short-limb dwarfism, costovertebral segmentation defects and abnormalities of the head, face and external genitalia.


name: rod-cone dystrophy, sensorineural deafness, and Fanconi-type renal dysfunction


ectodermal dysplasia-blindness syndrome

description: Ectodermal dysplasia-blindness syndrome is characterized by intellectual deficit, blindness caused by ocular malformations (microphthalmia, microcornea and sclerocornea), short stature, dysmorphic facial features (narrow nasal bridge and prominent ears), hypotrichosis, and malaligned teeth. It has been described in two siblings (brother and sister) and is likely to be transmitted as an autosomal recessive trait.


Rothmund-Thomson syndrome

description: Rothmund-Thomson syndrome (RTS) is a genodermatosis presenting with a characteristic facial rash (poikiloderma) associated with short stature due to pre- and postnatal growth delay, sparse scalp hair, sparse or absent eyelashes and/or eyebrows, juvenile cataracts, skeletal abnormalities, radial ray defects, premature aging and a predisposition to certain cancers.


EEC syndrome

description: EEC syndrome is a genetic developmental disorder characterized by ectrodactyly, ectodermal dysplasia, and orofacial clefts (cleft lip/palate).


saccharopinuria

description: Saccharopinuria is a disorder of lysine metabolism associated with hyperlysinaemia and lysinuria.


Sandhoff disease

description: Sandhoff disease is a lysosomal storage disorder from the GM2 gangliosidosis family and is characterized by central nervous system degeneration.


description: Microbrachycephaly-ptosis-cleft lip syndrome is characterized by the association of intellectual deficit, microbrachycephaly, hypotelorism, palpebral ptosis, a thin/long face, cleft lip, and anomalies of the lumbar vertebra, sacrum and pelvis. It has been described in two Brazilian sisters. Transmission appears to be autosomal recessive.


sarcosinemia

description: Sarcosinemia is a metabolic disorder characterized by an increased concentration of sarcosine in plasma and urine due to sarcosine dehydrogenase deficiency.


Schinzel-Giedion syndrome

description: Schinzel-Giedion syndrome (SGS) is an ectodermal dysplasia syndrome chiefly characterized by a distinctive facial dysmorphism, hydronephrosis, severe developmental delay, typical skeletal malformations, and genital and cardiac anomalies.


schizencephaly

description: Schizencephaly is a rare congenital cerebral malformation characterized by the presence of linear clefts in one or both hemispheres of the brain, extending from the lateral ventricles to the pial surface of the cortex, and that lead to a variety of neurological symptoms such as epilepsy, motor deficits, and psychomotor retardation.


autoimmune polyendocrinopathy type 2

description: Autoimmune polyglandular syndrome of likely polygenic etiology characterized by the presence of primary adrenal insufficiency in association with autoimmune thyroiditis and/or type 1 diabetes mellitus; this condition is not associated with mucocutaneous candidiasis.


schneckenbecken dysplasia

description: Schneckenbecken dysplasia (or chondrodysplasia with snail-like pelvis) is a prenatally lethal spondylodysplastic dysplasia.


name: craniometadiaphyseal dysplasia, wormian bone type

description: Craniometadiaphyseal dysplasia, wormian bone type is an extremely rare craniotubular bone dysplasia syndrome described in fewer than 10 patients to date. Clinical manifestations include macrocephaly, frontal bossing, malar hypoplasia, prominent mandible and dental hypoplasia. Other skeletal anomalies include abnormal bone modeling in tubular bones, multiple wormian bones and deformities of chest, pelvis and elbows. An increased risk of fractures is noted.


anterior segment dysgenesis 7

description: Any anterior segment dysgenesis in which the cause of the disease is a mutation in the PXDN gene.


sclerosteosis 1

description: Any sclerosteosis in which the cause of the disease is a mutation in the SOST gene.


sea-blue histiocyte syndrome

description: A rare, inherited or acquired syndrome characterized by the presence of histiocytes in the bone marrow which contain granules stained blue with hematoxylin-eosin stain, mild thrombocytopenia and purpura, and splenomegaly.


secretory component deficiency

description: Deficiency of secretory IgA (polymers of 2-4 IgA monomers are linked by two additional chains) and is the primary antibody response at the mucosal level, where it forms immune complexes with pathogens and allergens.


name: congenital generalized lipodystrophy type 2

description: Any congenital generalized lipodystrophy in which the cause of the disease is a mutation in the BSCL2 gene.


name: seizures, benign familial neonatal, autosomal recessive


name: combined immunodeficiency due to ZAP70 deficiency

description: Combined immunodeficiency due to ZAP70 deficiency is a very rare, severe, genetic, combined immunodeficiency disorder characterized by lymphocytosis, decreased peripheral CD8+ T-cells, and presence of normal circulating CD4+ T-cells, leading to immune dysfunction.


Beemer-Langer syndrome

description: Short rib-polydactyly syndrome (SRPS), Beemer-Langer type is an extremely rare type of SRPS developing prenatally or immediately after birth and characterized by short and narrow thorax with horizontally oriented ribs. Other bone features include small iliac bones, short tubular bones, bowing of long bones and rarely pre- and post-axial polydactyly. Brain defects are common and some cases of cleft lip, absent internal genitalia and renal, biliary and pancreatic cysts have been reported. The course is rapidly fatal.


SHORT syndrome

description: SHORT syndrome is a rare inherited condition of multiple anomalies whose name stands for short stature, hyperextensibility of joints, ocular depression, Rieger anomaly and teething delay which, along with mild intrauterine growth restriction, partial lipodystrophy, delayed bone age, hernias and progeroid appearance, are manifestations of the disease.


name: free sialic acid storage disease, infantile form


sialuria

description: Sialuria is an extremely rare metabolic disorder described in fewer than 10 patients to date and characterized by variable signs and symptoms, mostly in infancy, including transient failure to thrive, slightly prolonged neonatal jaundice, equivocal or mild hepatomegaly, microcytic anemia, frequent upper respiratory infections, gastroenteritis, dehydration and flat and coarse facies. Learning difficulties and seizures may occur in childhood.


situs inversus

description: A congenital condition in which there is complete right-to-left reversal of the position of the major thoracic and abdominal organs (that is, they are arranged in a mirror image of the normal positioning).


Sjogren syndrome

description: An autoimmune disorder in which immune cells attack and destroy the glands that produce tears and saliva. Sjögren syndrome is also associated with rheumatic disorders such as rheumatoid arthritis or systemic lupus erythematosus. The hallmark symptoms of Sjögren syndrome are dry mouth and dry eyes. In addition, Sjogren syndrome may cause skin, nose, and vaginal dryness. It also may affect other organs of the body including the kidneys, blood vessels, lungs, liver, pancreas, and brain


Sjogren-Larsson syndrome

description: A neurocutaneous disorder caused by an inborn error of lipid metabolism and characterized by congenital ichthyosis, intellectual deficit, and spasticity.


name: Sjogren-Larsson-like ichthyosis without CNS or eye involvement


generalized peeling skin syndrome

description: Generalized peeling skin syndrome (PSS) is a form of PSS presenting with a generalized distribution. It comprises two sub-types: the non-inflammatory (PSS type A) and the inflammatory (PSS type B) form. PSS type A is characterized by generalized white scaling with superficial peeling of the skin, while PSS type B is characterized by superficial patchy peeling of the entire skin with underlying erythroderma, associated with pruritus, and atopy.


Smith-Lemli-Opitz syndrome

description: Smith-Lemli-Opitz syndrome (SLOS) is characterized by multiple congenital anomalies, intellectual deficit, and behavioral problems.


congenital secretory sodium diarrhea 3

description: Any secretory diarrhea in which the cause of the disease is a mutation in the SPINT2 gene.


name: sodium-potassium-ATPase activity of red cell


name: growth delay due to insulin-like growth factor I resistance

description: Growth delay due to IGF-I resistance is characterized by variable intrauterine and postnatal growth retardation and elevated serum IGF-I levels. Addition features include variable degrees of intellectual deficit, microcephaly and dysmorphism (broad nasal bridge and tip, smooth philtrum, thin upper and everted lower lips, short fingers, clinodactyly, wide-set nipples and pectus excavatum).


name: congenital heart defect-round face-developmental delay syndrome

description: Heart defect B round face B congenital developmental delay is very rare syndrome described in three sibs of one Japanese family and characterized by congenital heart disease, round face with depressed nasal bridge, small mouth, short stature, and relatively dark skin and typical dermatoglyphic anomalies, and intellectual deficit.


name: ataxia, spastic, childhood-onset, autosomal recessive, with optic atrophy and intellectual disability


Charlevoix-Saguenay spastic ataxia

description: Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a neurodegenerative disorder characterized by early-onset cerebellar ataxia with spasticity, a pyramidal syndrome and peripheral neuropathy.


name: spastic diplegia and intellectual disability


hereditary spastic paraplegia 17

description: Any hereditary spastic paraplegia in which the cause of the disease is a mutation in the BSCL2 gene.


hereditary spastic paraplegia 15

description: Autosomal recessive spastic paraplegia type 15 is a complex form of hereditary spastic paraplegia characterized by a childhood to adulthood onset of slowly progressive lower limb spasticity (resulting in gait disturbance, extensor plantar responses and decreased vibration sense) associated with mild intellectual disability, mild cerebellar ataxia, peripheral neuropathy (with distal upper limb amyotrophy) and retinal degeneration. Thin corpus callosum is a common imaging finding.


hereditary spastic paraplegia 23

description: Autosomal recessive spastic paraplegia type 23 (SPG23) is a rare, complex type of hereditary spastic paraplegia that presents in childhood with progressive spastic paraplegia, associated with peripheral neuropathy, skin pigment abnormalities (i.e. vitiligo, hyperpigmentation, diffuse lentigines), premature graying of hair, and characteristic facies (i.e. thin with ''sharp'' features). The SPG23 phenotype has been mapped to a locus on chromosome 1q24-q32.


hereditary spastic paraplegia 5A

description: Autosomal recessive spastic paraplegia type 5A (SPG5A) is a form of hereditary spastic paraplegia characterized by either a pure phenotype of slowly progressive spastic paraplegia of the lower extremities with bladder dysfunction and pes cavus or a complex presentation with additional manifestations including cerebellar signs, nystagmus, distal or generalized muscle atrophy and cognitive impairment. Age of onset is highly variable, ranging from early childhood to adulthood. White matter hyperintensity and cerebellar and spinal cord atrophy may be noted, on brain magnetic resonance imaging, in some patients.


name: spastic paraplegia with myoclonic epilepsy


name: spastic paraplegia-glaucoma-intellectual disability syndrome

description: Spastic paraplegia-glaucoma-intellectual disability syndrome is characterized by progressive spastic paraplegia, glaucoma and intellectual deficit. It has been described in two families. The second described sibship was born to consanguineous parents. The mode of inheritance is autosomal recessive.


name: spastic tetraplegia-retinitis pigmentosa-intellectual disability syndrome

description: Spastic tetraplegia-retinitis pigmentosa-intellectual disability syndrome is characterized by nonprogressive spastic paraplegia, retinitis pigmentosa, and intellectual deficit. It has been described in two brothers born to consanguineous parents.


spermatogenic failure 4

description: Any azoospermia in which the cause of the disease is a mutation in the SYCP3 gene.


hereditary spherocytosis type 3

description: Any hereditary spherocytosis in which the cause of the disease is a mutation in the SPTA1 gene.


name: spinal muscular atrophy with intellectual disability


name: spinal muscular atrophy with microcephaly and mental subnormality


spinal muscular atrophy, type IV

description: Proximal spinal muscular atrophy type 4 (SMA4) is the adult-onset form of proximal spinal muscular atrophy characterized by muscle weakness and hypotonia resulting from the degeneration and loss of the lower motor neurons in the spinal cord and the brain stem nuclei.


name: scapuloperoneal spinal muscular atrophy, autosomal recessive


name: mitochondrial DNA depletion syndrome 7 (hepatocerebral type)

description: Infantile-onset spinocerebellar ataxia (IOSCA) is a hereditary neurological disorder with early and severe involvement of both the peripheral and central nervous systems. It has only been described in Finnish families.


name: autosomal recessive cerebellar ataxia-blindness-deafness syndrome


description: Spinocerebellar ataxia-dysmorphism is marked by characteristic facies associated with dysarthria, delayed psychomotor development, ataxia, scoliosis and foot deformities. Three cases have been described and transmission appears to be autosomal recessive.


corneal-cerebellar syndrome

description: A rare, genetic, neurological disorder characterized by the association of slowly progressive spinocerebellar degeneration and corneal dystrophy, manifesting with bilateral corneal opacities (which lead to severe visual impairment), mild intellectual disability, ataxia, gait disturbances, and tremor. Additional manifestations include facial dysmorphism (i.e. triangular face, ptosis, low-set, posteriorly angulated ears, and micrognathia), as well as mild upper motor neuron involvement with hypertonia, lower limb hyperreflexia and extensor plantar responses. There have been no further descriptions in the literature since 1985.


name: spastic ataxia-corneal dystrophy syndrome

description: Mousa-AlDin-AlNassar syndrome is characterized by the presence of spastic ataxia in association with bilateral congenital cataract, corneal dystrophy, and nonaxial myopia.


name: spinocerebellar degeneration with slow eye movements


familial isolated congenital asplenia

description: Familial isolated congenital asplenia is a rare, non-syndromic, potentially life-threatening visceral malformation characterized by the absence of normal spleen function, resulting in a primary immunodeficiency. Typically, the condition manifests with severe, recurrent, overwhelming infections (especially pneumococcal sepsis) in otherwise apparently healthy infants. In adults with no history of severe sepsis in infancy, thrombocytosis may be the presenting sign. Howell-Jolly bodies on blood smears and an absent spleen on abdominal ultrasound examination are highly suggestive associated findings.


name: spondyloepimetaphyseal dysplasia, sponastrime type

description: A rare genetic disorder characterized by bone marrow failure, spinal abnormalities, saddle nose, and metaphysical striation.


name: spondylocostal dysostosis-anal and genitourinary malformations syndrome

description: Spondylocostal dysostosis-anal and genitourinary malformations syndrome is characterized by the association of spondylocostal dysostosis with anal and genitourinary malformations (anal atresia and agenesis of external and internal genitalia). To date, only four cases have been described in the literature. Autosomal recessive inheritance has been suggested.


name: spondyloepiphyseal dysplasia tarda, autosomal recessive

description: Autosomal recessive form of spondyloepiphyseal dysplasia tarda.


name: spondyloepiphyseal dysplasia tarda, Kohn type

description: Spondyloepiphyseal dysplasia tarda, Kohn type is characterized by short trunk dwarfism, progressive involvement of the spine and epiphyses and mild-to-moderate intellectual deficit.


name: spondyloepimetaphyseal dysplasia with joint laxity, type 1, with or without fractures

description: Any spondyloepimetaphyseal dysplasia with joint laxity in which the cause of the disease is a mutation in the B3GALT6 gene.


name: spondyloepimetaphyseal dysplasia, Irapa type

description: A spondyloepimetaphyseal dysplasia is characterized by disproportionate short-trunked short stature, pectus carinatum, short arms, short and broad hands, short metatarsals, flat and broad feet, coxa vara, genu valgum, osteoarthritis, arthrosis and moderate-to-serious gait impairment.


name: spondyloepimetaphyseal dysplasia-short limb-abnormal calcification syndrome

description: A rare, genetic primary bone dysplasia disorder characterized by disproportionate short stature with shortening of upper and lower limbs, short and broad fingers with short hands, narrowed chest with rib abnormalities and pectus excavatum, abnormal chondral calcifications (incl. larynx, trachea and costal cartilages) and facial dysmorphism (frontal bossing, hypertelorism, prominent eyes, short flat nose, wide nostrils, high-arched palate, long philtrum). Platyspondyly (esp. of cervical spine) and abnormal epiphyses and metaphyses are observed on radiography. Atlantoaxial instability causing spinal compression and recurrent respiratory disease are potential complications that may result lethal.


spondyloperipheral dysplasia

description: A condition caused by by truncating mutations in the C-propeptide of COL2A1. Like other type II collagen disorders it is characterized by short stature, platyspondyly and epiphyseal dysplasia. A distinguishing feature is the presence of brachydactyly with a prominent first toe.


Canavan disease

description: A neurodegenerative disorder; its spectrum varies between severe forms with leukodystrophy, macrocephaly and severe developmental delay, and a very rare mild/juvenile form characterized by mild developmental delay.


name: familial infantile bilateral striatal necrosis

description: The familial form of infantile bilateral striatal necrosis (IBSN), a syndrome of bilateral symmetric spongy degeneration of the caudate nucleus, putamen and globus pallidus characterized by developmental regression, choreoathetosis and dystonia progressing to spastic quadriparesis.


name: subaortic stenosis-short stature syndrome


name: succinic semialdehyde dehydrogenase deficiency

description: Succinic semialdehyde dehydrogenase (SSADH) deficiency is a rare neurometabolic disorder of gamma-aminobutyric acid (GABA) metabolism with a nonspecific clinical presentation (ranging from mild to severe) with the most frequent symptoms being cognitive impairment with prominent deficit in expressive language, hypotonia, ataxia, epilepsy, and behavioral dysregulation.


name: sucrosuria, hiatus hernia and intellectual disability


Schilder disease

description: Schilder's disease is a progressive demyelinating disorder of the central nervous system.


Sugarman brachydactyly

description: Sugarman brachydactyly is a rare, genetic, congenital limb malformation characterized by brachydactyly of fingers, with major proximal phalangeal shortening and immobile proximal interphalangeal joints, as well as dorsally and proximally placed, non-articulating great toes (with or without angulation). Radiographic findings of hands include bilateral double first metacarpals and biphalangeal fifth fingers. There have been no further descriptions in the literature since 1982.


mucosulfatidosis

description: Multiple sulfatase deficiency (MSD) is a very rare and fatal lysosomal storage disease characterized by a clinical phenotype that combines the features of different sulfatase deficiencies (whether lysosomal or not) that can have neonatal (most severe), infantile (most common) and juvenile (rare) presentations with manifestations including hypotonia, coarse facial features, mild deafness, skeletal anomalies, ichthyosis, hepatomegaly, developmental delay, progressive neurologic deterioration and hydrocephalus.


isolated sulfite oxidase deficiency

description: Abnormally reduced sulfite oxidase level.


Summitt syndrome

description: Summitt syndrome is an extremely rare disorder originally described in two brothers and characterized by mild to severe craniosynostosis and syndactyly, obesity, and normal intelligence. Acrocephaly, brachydactyly, clinodactyly, mild syndactyly of the hands and feet, genu valgum and marked obesity were later described in another patient. There have been no further descriptions in the literature since 1979. Summitt syndrome could be a variant of Carpenter syndrome.


Cold-induced sweating syndrome 1

description: Crisponi syndrome (CS) is a severe disorder characterized by muscular contractions at birth, intermittent hyperthermia, facial abnormalities and camptodactyly.


Filippi syndrome

description: Filippi syndrome is characterized by microcephaly, cutaneous syndactyly of the fingers and toes, intellectual deficit, growth retardation and a characteristic facies (high and broad nasal bridge, thin alae nasi, micrognathia and a high frontal hairline). So far, less than 25 cases have been reported. Cryptorchidism, polydactyly, and teeth and hair anomalies may also be present. Transmission is autosomal recessive.


spondylocarpotarsal synostosis syndrome

description: Spondylocarpotarsal synostosis (SCT) syndrome is a skeletal dysplasia clinically characterized by postnatal progressive vertebral fusions frequently manifesting as block vertebrae, contributing to an undersized trunk and a disproportionate short stature, scoliosis, lordosis, carpal and tarsal synostosis, with club feet and a mild facial dysmorphism.


taurodontism

description: Taurodontism is a dental anomaly characterized by an elongated pulp chamber, displaced toward the apical floor of the tooth with no constriction at the level of the cemento-enamel junction, and short roots. It most frequently affects permanent molar teeth. Taurodontism increases the risk of pulp exposure. It can be isolated or associated with certain syndromes such as Down syndrome, amelogenesis imperfecta, and Klinefelter syndrome.


Tay-Sachs disease AB variant

description: GM2 gangliosidosis, AB variant is an extremely rare, severe genetic disorder characterized by progressive neurological decline due to ganglioside activator deficiency.


Tay-Sachs disease

description: GM2 gangliosidosis, variant B or Tay-Sachs disease is marked by accumulation of G2 gangliosides due to hexosaminidase A deficiency.


Teebi-Shaltout syndrome

description: Teebi-Shaltout syndrome is a rare, genetic, development defect during embryogenesis malformation syndrome characterized by association of characteristic facial features (including abnormal head shape with narrow forehead, hypertelorism, telecanthus, small earlobes, broad nasal bridge and tip, underdeveloped ala nasi, small/wide mouth and high/cleft palate), ectodermal dysplasia (including oligodontia with delayed dentition, slow growing hair and reduced sweating) and skeletal abnormalities including camptodactyly and caudal appendage. Short stature and abnormal palmar creases are additional clinical features.


name: taurodontia-absent teeth-sparse hair syndrome

description: This syndrome is characterized by congenital absence of the teeth, and sparse or absent hair. Taurodontia is also present in the majority of cases. The syndrome has been described in less than 15 patients from different families.


teeth, fused

description: The union of two separately developing tooth germs typically leading to one less tooth than normal in the affected dental arch.


name: non-eruption of teeth-maxillary hypoplasia-genu valgum syndrome

description: Noneruption of teeth - maxillary hypoplasia - genu valgum is an extremely rare syndrome that is characterized by multiple unerupted permanent teeth, hypoplasia of the alveolar process and of the maxillo-zygomatic region, severe genu valgum and deformed ears.


testicular germ cell tumor

description: A germ cell tumor arising from the testis. Representative examples include teratoma, seminoma, embryonal carcinoma, and yolk sac tumor.


name: tetraamelia with ectodermal dysplasia and lacrimal duct abnormalities


description: Tetraamelia - multiple malformations is an extremely rare mostly lethal congenital disorder characterized by absence of all four limbs and frequent associated major malformations involving the head, face, eyes, skeleton, heart, lungs, anus, urogenital, and central nervous systems. The syndrome has been described in fewer than 20 patients mainly of middle Eastern descent.


odontotrichomelic syndrome

description: Odontotrichomelic syndrome is characterized by malformations of all four extremities, hypoplastic nails, ear anomalies, hypotrichosis, abnormal dentition, hyperhidrosis and nasolacrimal duct obstruction. So far, it has been described in less than 10 patients. Transmission is autosomal recessive.


name: thalamic degeneration, symmetric infantile


name: thanatophoric dysplasia, Glasgow variant


3M syndrome 1

description: Any 3-M syndrome in which the cause of the disease is a mutation in the CUL7 gene.


inherited threoninemia

description: An increased concentration of threonine in the blood.


thrombocytopenia-absent radius syndrome

description: Thrombocytopenia-absent radius (TAR) syndrome is a very rare congenital malformation syndrome characterized by bilateral radial aplasia and thrombocytopenia.


name: congenital thrombotic thrombocytopenic purpura

description: Congenital thrombotic thrombocytopenic purpura is the hereditary form of thrombotic thrombocytopenic purpura (TTP) characterized by profound peripheral thrombocytopenia, microangiopathic hemolytic anemia (MAHA) and single or multiple organ failure of variable severity.


name: upper limb defect-eye and ear abnormalities syndrome

description: Upper limb defect - eye and ear abnormalities syndrome associates upper limb defects (hypoplastic thumb with hypoplasia of the metacarpal bone and phalanges and delayed bone maturation), developmental delay, central hearing loss, unilateral poorly developed antihelix, bilateral choroid coloboma and growth retardation.


thymoma, familial

description: An instance of thymoma (disease) that is caused by an inherited modification of the individual's genome.


thyrocerebrorenal syndrome

description: Thyrocerebrorenal syndrome is characterized by renal, neurologic, thyroid disease, associated with thrombocytopenia. It has been described in a brother and his sister. Intelligence was normal. It is transmitted as an autosomal recessive trait.


thymic-renal-anal-lung dysplasia

description: This syndrome is characterized by intrauterine growth retardation, renal dysgenesis and a unilobed or absent thymus.


description: Dihydropyrimidine dehydrogenase (DPD) deficiency isaconditionin which the body cannot break down the nucleotides thymine and uracil. DPD deficiency can have a wide range of severity; some individuals may have various neurological problems, while others have no signsand symptoms. Signs and symptoms in severely affected individuals begin in infancy and may include seizures, intellectual disability, microcephaly, increased muscle tone (hypertonia), delayed motor skills, and autistic behavior. All individuals with the condition, regardless of the presence or severity of symptoms, are at risk for severe, toxic reactions to drugs called fluoropyrimidines which are used to treat cancer. Individuals with no symptoms may be diagnosed only by laboratory testing or after exposure to fluoropyrimidines. DPD deficiency is caused by mutations in the DPYD gene and is inherited in an autosomal recessive manner.


name: thyroid hormone resistance, generalized, autosomal recessive

description: A rare, autosomal recessive inherited disorder usually caused by mutations in the THRB gene. It is characterized by a defective physiological resistance to thyroid hormones, resulting in the elevation of thyroxin and triiodothyronine in the serum.


familial thyroid dyshormonogenesis

description: A type of primary congenital hypothyroidism, a permanent thyroid hormone deficiency that is present from birth, which results from inborn errors of thyroid hormone synthesis.


thyroid dyshormonogenesis 2A

description: Thyroid peroxidase system defect due to presumed mutation(s) in the TPO gene, resulting in decreased activity of thyroid peroxidase.


Pendred syndrome

description: Pendred syndrome (PDS) is a clinically variable genetic disorder characterized by bilateral sensorineural hearing loss and euthyroid goiter.


thyroid dyshormonogenesis 3

description: Any familial thyroid dyshormonogenesis in which the cause of the disease is a mutation in the TG gene.


thyroid dyshormonogenesis 4

description: Any familial thyroid dyshormonogenesis in which the cause of the disease is a mutation in the IYD gene.


thyroid dyshormonogenesis 5

description: Any familial thyroid dyshormonogenesis in which the cause of the disease is a mutation in the DUOXA2 gene.


thyrotoxicosis

description: A hypermetabolic syndrome caused by the elevation of thyroid hormone levels in the serum. Signs and symptoms include tachycardia, palpitations, tremor, weight loss, warm weather intolerance, and moist skin. Causes include Graves disease, toxic nodular goiter, toxic thyroid nodule, and lymphocytic thyroiditis.


name: isolated thyroid-stimulating hormone deficiency

description: Isolated thyroid-stimulating hormone (TSH) deficiency is a type of central congenital hypothyroidism, a permanent thyroid deficiency that is present from birth, characterized by low levels of thyroid hormones due to a deficiency in TSH synthesis.


name: isolated thyrotropin-releasing hormone deficiency

description: Hypothyroidism due to dysfunction of the hypothalamus, assumed to result in reduced secretion of thyrotropin- releasing hormone.


name: hypothyroidism due to TSH receptor mutations

description: Hypothyroidism due to thyroid-stimulating hormone (TSH) receptor mutations is a type of primary congenital hypothyroidism, a permanent thyroid hormone deficiency that is present from birth due to thyroid resistance to TSH.


tibial hemimelia

description: Tibial hemimelia is a rare congenital anomaly characterized by deficiency of the tibia with a relatively intact fibula.


name: tibia, absence of, with congenital deafness


Kerion celsi

description: A rare inflammatory and suppurating type of tinea capitis, a skin infection caused by Trichophyton or Microsporum fungi, that predominantly affects the scalp and that is characterized by the development of painful crusty lesions covered with follicular pustules and surrounded by erythematous alopecic areas, that can later evolve into abscesses and leave permanent cicatricial alopecia. Lesions can be associated with regional lymphadenopathy.


Mounier-Kuhn syndrome

description: Mounier-Kuhn syndrome, also known as idiopathic tracheobronchomegaly, is a congenital disorder characterized by marked dilatation of the trachea and proximal bronchi that leads to impaired airway secretion clearance and recurrent lower respiratory tract infections.


transcobalamin II deficiency

description: Transcobalamin deficiency (TC) is a disorder of cobalamin transport that usually presents during the first few months of life and is characterized by megaloblastic anemia, failure to thrive, vomiting, weakness and pancytopenia.


head and neck squamous cell carcinoma

description: A squamous cell carcinoma that arises from any of the following anatomic sites: lip and oral cavity, nasal cavity, paranasal sinuses, pharynx, larynx, and salivary glands.


name: trichomegaly-retina pigmentary degeneration-dwarfism syndrome

description: Trichomegaly-retina pigmentary degeneration-dwarfism syndrome, also known as Oliver-McFarlane syndrome, is an extremely rare genetic disorder characterized by hair abnormalities, severe chorioretinal atrophy, hypopituitarism, short stature, and intellectual disability.


trichoodontoonychial dysplasia

description: Trichoodontoonychial dysplasia is a rare ectodermal dysplasia syndrome characterized by severe generalized hypotrichosis, parietal alopecia, secondary anodontia resulting from enamel hypoplasia, onychodystrophy, bone deficiency in the frontoparietal region and skin manifestations (incl. nevus pigmentosus, papules, ephelides, palmoplantar keratosis, supernumerary nipples, abnormal dermatoglyphics). There have been no further descriptions in the literature since 1983.


name: trigonocephaly-bifid nose-acral anomalies syndrome

description: Trigonocephaly-bifid nose-acral anomalies syndrome is characterized by trigonocephaly, brachycephaly, bulbous nose (bifid at the tip), micrognathia, macrostomia, hypotonia and relatively broad metatarsals and phalanges.


Troyer syndrome

description: Autosomal recessive spastic paraplegia type 20 (SPG20) is a type of complex hereditary spastic paraplegia characterized by an onset in infancy of progressive spastic paraparesis associated with distal amyotrophy, psuedobulbar palsy, motor and cognitive delays, mild cerebellar signs (dysarthria, dysdiadochokinesia, mild intention tremor), short stature and subtle skeletal abnormalities (pes cavus, mild talipes equinovarus, kyphoscoliosis). SPG20 is due to mutations in the SPG20 gene (13q13.1), which encodes the protein spartin.


mismatch repair cancer syndrome 1

description: A rare childhood cancer predisposition syndrome caused by biallelic inheritance of mutations in MLH1, MSH2, MSH6, or PMS2 genes. It is characterized by the development of childhood cancers, usually hematological malignancies and/or brain tumors, and colorectal cancers with multiple intestinal polyps. The majority of patients show signs of neurofibromatosis type 1.


tyrosinemia type II

description: Tyrosinemia type 2 is an inborn error of tyrosine metabolism characterized by hypertyrosinemia with oculocutaneous manifestations and, in some cases, intellectual deficit.


tyrosinemia type I

description: Tyrosinemia type 1 (HTI) is an inborn error of tyrosine catabolism caused by defective activity of fumarylacetoacetate hydrolase (FAH) and is characterized by progressive liver disease, renal tubular dysfunction, porphyria-like crises and a dramatic improvement in prognosis following treatment with nitisinone.


tyrosinemia type III

description: Tyrosinemia type 3 is an inborn error of tyrosine metabolism characterized by mild hypertyrosinemia and increased urinary excretion of 4-hydroxyphenylpyruvate, 4-hydroxyphenyllactate and 4-hydroxyphenylacetate.


phocomelia, Schinzel type

description: Schinzel phocomelia syndrome, also called limb/pelvis hypoplasia/aplasia syndrome, is characterized by skeletal malformations affecting the ulnae, pelvic bones, fibulae and femora. As the phenotype is similar to that described in the malformation syndrome known as Al-Awadi/Raas-Rothschild syndrome, they are thought to be the same disorder.


name: ulna hypoplasia-intellectual disability syndrome

description: Ulna hypoplasia - intellectual deficit is a very rare syndrome characterized by mesomelic shortness of the forearms, bilateral clubfeet, aplasia or hypoplasia of all nails and severe psychomotor retardation.


name: ulnar agenesis and endocardial fibroelastosis


urocanic aciduria

description: Encephalopathy due to urocanase deficiency is an extremely rare histidine metabolism disorder characterized by urocanic aciduria and other variable manifestations including intellectual deficit and intermittent ataxia in the 4 cases reported to date.


Usher syndrome type 1

description: A syndrome characterized by congenital, bilateral, severe sensorineural hearing loss, abnormalities in the vestibular system, and adolescent-onset retinitis pigmentosa.


Usher syndrome type 2A

description: Any Usher syndrome in which the cause of the disease is a mutation in the USH2A gene.


Usher syndrome type 3A

description: Any Usher syndrome in which the cause of the disease is a mutation in the CLRN1 gene.


Usher syndrome type 1C

description: A form of Usher syndrome type I that is caused by homozygous or compound heterozygous mutation in the gene encoding harmonin on chromosome 11p15. It is inherited in an autosomal recessive manner.


VACTERL with hydrocephalus

description: VACTERL is an acronym for Vertebral anomalies, Anal atresia, Congenital cardiac disease, tracheoesophageal fistula, Renal anomalies, and Limb defects. VACTERL associated with hydrocephalus has rarely been reported and is thought to be an autosomal recessive anomaly. The condition is described as a uniformly lethal or developmentally devastating disorder distinct from the VATER association.


name: Mayer-Rokitansky-Kuster-Hauser syndrome type 1

description: Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome type 1, a form of MRKH syndrome, is an isolated form of congenital aplasia of the uterus and 2/3 of the vagina occurring in otherwise phenotypically normal females.


Valinemia

description: Valinemia is a very rare metabolic disorder characterized by abnormally high levels of the amino acid valine in the blood and urine.Infants with valinemia reportedly experience lack of appetite, vomiting, and failure to thrive. In some cases, the condition may be life-threatening. Low muscle tone (hypotonia), excessive drowsiness, hyperactivity, and developmental delay have also been reported. Valinemia is caused by a deficiency of the enzymevaline transaminase, which is needed for the breakdown (metabolism) of valine in the body. It is inherited in an autosomal recessive manner, although the gene responsible for the condition is not yet known. Treatment includes adiet low in valine (introduced during early infancy) which usually improves symptoms and brings valine levels to normal.


orofaciodigital syndrome type 6

description: Joubert syndrome with orofaciodigital defect (or oral-facial-digital syndrome type 6, OFD6) is a very rare subtype of Joubert syndrome and related disorders (JSRD) characterized by the neurological features of JS associated with orofacial anomalies and often polydactyly.


vascular hyalinosis

description: A syndrome characterized by progressive hyalinosis involving capillaries and often arterioles and small veins of the digestive tract, kidneys, and idiopathic cerebral calcifications. It has been described in three sisters born to non-consanguineous parents. All three patients also had poikilodermia and graying hair, as well as severe diarrhea, rectal bleeding, malabsorption and subarachnoid hemorrhage.


name: congenital bilateral aplasia of vas deferens from CFTR mutation

description: An autosomal recessive disorder that is associated with mutation(s) in the CFTR gene, encoding cystic fibrosis transmembrane conductance regulator. Mutation(s) in the same gene are associated with cystic fibrosis.


isolated right ventricular hypoplasia

description: Isolated right ventricular hypoplasia (IRVH) is a rare congenital heart malformation characterized by underdevelopment of the right ventricle associated with patent foramen ovale or interauricular communication and normally developed tricuspid and pulmonary valves. IRVH manifests with severe cyanosis, congestive heart failure, and in severe cases, death in early infancy.


name: autosomal recessive spondylocostal dysostosis

description: Autosomal recessive spondylocostal dysostosis (ARSD) is a rare condition of variable severity associated with vertebral and rib segmentation defects and characterized by a short neck with limited mobility, winged scapulae, a short trunk, and short stature with multiple vertebral anomalies at all levels of the spine.


description: Oculogastrointestinal muscular dystrophy is an extremely rare autosomal recessively inherited neuromuscular disease characterized by ocular manifestations such as ptosis and diplopia followed by chronic diarrhea, malnutrion and intestinal peudo-obstruction.


name: hypercarotenemia and vitamin A deficiency, autosomal recessive


name: methylmalonic aciduria and homocystinuria type cblF

description: A form of methylmalonic acidemia with homocystinuria, an inborn error of vitamin B12 (cobalamin) metabolism characterized by megaloblastic anemia, lethargy, failure to thrive, developmental delay, intellectual deficit and seizures. The disorder is caused by mutations in the LMBRD1 gene (6q13) and is transmitted in an autosomal recessive manner.


name: methylmalonic aciduria and homocystinuria type cblC

description: A form of methylmalonic acidemia with homocystinuria, an inborn error of vitamin B12 (cobalamin) metabolism characterized by megaloblastic anemia, lethargy, failure to thrive, developmental delay, intellectual deficit and seizures. cblC type methylmalonic acidemia with homocystinuria is caused by mutations in the MMACHC gene (1p36.3) and is transmitted in an autosomal recessive manner.


name: methylmalonic aciduria and homocystinuria type cblD

description: A form of methylmalonic acidemia with homocystinuria, an inborn error of vitamin B12 (cobalamin) metabolism characterized by variable biochemical, neurological and hematological manifestations.


vitamin D-dependent rickets, type 2A

description: Rickets caused by a defect in the VDR gene, encoding the vitamin D receptor. This form of rickets is characterized by hypocalcemia, elevated 1,25-dihydroxyvitamin D (calcitriol) concentrations and may also manifest with alopecia.


name: vitamin K-dependent clotting factors, combined deficiency of, type 1

description: Combined vitamin K-dependent clotting factors deficiency (VKCFD) is a congenital bleeding disorder resulting from variably decreased levels of coagulation factors II, VII, IX and X, as well as natural anticoagulants protein C, protein S and protein Z.


name: familial isolated deficiency of vitamin E

description: Ataxia with vitamin E deficiency (AVED) is a neurodegenerative disease belonging to the inherited cerebellar ataxias. It is mainly characterized by progressive spino-cerebellar ataxia, loss of proprioception, areflexia, and is associated with a marked deficiency in vitamin E.


name: vitiligo, progressive, with intellectual disability and urethral duplication


von Willebrand disease 3

description: Type 3 von Willebrand disease (type 3 VWD) is the most severe form of VWD characterized by a bleeding disorder associated with a total or near-total absence of Willebrand factor (von Willebrand factor; VWF) in the plasma and cellular compartments, also leading to a profound deficiency of plasmatic factor VIII (FVIII).


Waardenburg syndrome type 4A

description: A subtype of Waardenburg syndrome type 4 (Waardenburg-Shah syndrome) caused by mutations in EDNRB.


Weaver syndrome

description: Weaver syndrome (WVS) is a rare, multisystem disorder characterized by tall stature, a typical facial appearance (hypertelorism, retrognathia) and variable intellectual disability. Additional features may include camptodactyly, soft doughy skin, umbilical hernia, and a low hoarse cry.


Weill-Marchesani syndrome 1

description: Any Weill-Marchesani syndrome in which the cause of the disease is a mutation in the ADAMTS10 gene.


Werner syndrome

description: A rare inherited syndrome characterized by premature aging with onset in the third decade of life and with cardinal clinical features including bilateral cataracts, short stature, graying and thinning of scalp hair, characteristic skin disorders and premature onset of additional age-related disorders.


Wernicke-Korsakoff syndrome

description: Wernicke-Korsakoff syndrome is a brain disorder, due to thiamine deficiency that has been associated with both Wernicke's encephalopathy and Korsakoff syndrome. The term refers to two different syndromes, each representing a different stage of the disease. Wernicke's encephalopathy represents the 'acute' phase and Korsakoff's syndrome represents the 'chronic' phase. However, they are used interchangeable in many sites. Wernicke's encephalopathy is characterized by confusion, abnormal stance and gait (ataxia), and abnormal eye movements (nystagmus). Korsakoff's syndrome is observed in a small number of patients. It is a type of dementia, characterized by memory loss and confabulation (filling in of memory gaps with data the patient can readily recall) and involvement of the heart, vascular, and nervous system. Wernicke-Korsakoff syndrome mainly results from chronic alcohol use, but also from dietary deficiencies, prolonged vomiting, eating disorders, systemic diseases (cancer, AIDS, infections), bariatric surgery, transplants, or the effects of chemotherapy. Studies indicate that there may be some genetic predisposition for the disease.Treatment involves supplementing the diet with thiamine. Wernicke encephalopathy is an acute syndrome and requires emergency treatment to prevent death and neurologic complications. In cases where the diagnosis is not confirmed, patients should still be treated while additional evaluations are completed.


white forelock with malformations

description: White forelock with malformations is a multiple congenital anomalies syndrome characterized by poliosis, distinct facial features (epicanthal folds, hypertelorism, posterior rotation of ears, prominent philtrum, high-arched palate) and congenital anomalies/malformations of the eye (blue sclera), cardiopulmonary (atrial septal defect, prominent thoracic and abdominal veins), and skeletal (clinodactyly, syndactyly of the fingers and 2nd and 3rd toes) systems. There have been no further descriptions in the literature since 1980.


Wilson disease

description: A very rare inherited multisystemic disease presenting non-specific neurological, hepatic, psychiatric or osseo-muscular manifestations due to excessive copper deposition in the body.


Winchester syndrome

description: An autosomal recessive inherited disorder, caused by mutation(s) in the MMP14 gene, encoding matrix metalloproteinase-14. It is characterized by short stature, coarse facial features, flat nose, joint contractures, severe osteolysis in the hands and feet, and generalized osteoporosis.


intellectual disability, Wolff type

description: Intellectual disability, Wolff type is a rare intellectual disability syndrome characterized by severe intellectual disability, characteristic facial features (low anterior hairline, upward slanting palpebral fissures, ocular hypertelorism, broad, bulbous nose, large ears with helix incompletely developed, thick lips, and micrognathia) and additional anomalies including peripheral joint contractures, delayed skeletal maturation, bilateral cleft lip and palate, strabismus, terminal hypoplasia of fingers, hypospadias, and bilateral inguinal hernias.


hypotrichosis 8

description: Any hypotrichosis in which the cause of the disease is a mutation in the LPAR6 gene.


name: wooly hair-hypotrichosis-everted lower lip-outstanding ears syndrome


wrinkly skin syndrome

description: A type of cutis laxa that is characterized by wrinkling of the skin of the dorsum of the hands and feet, an increased number of palmar and plantar creases, wrinkled abdominal skin, multiple skeletal abnormalities (joint laxity and congenital hip dislocation), late closing of the anterior fontanel, microcephaly, pre- and postnatal growth retardation, developmental delay and facial dysmorphism (a broad nasal bridge, downslanting palpebral fissures and hypertelorism).


xanthinuria type I

description: A rare autosomal recessive disorder of purine metabolism characterized by the isolated deficiency of xanthine dehydrogenase, causing hyperxanthinemia with low or absent uric acid and xanthinuria, leading to urolithiasis, hematuria, renal colic and urinary tract infections, while some patients are asymptomatic and others suffer from kidney failure. Less common manifestations include arthropathy, myopathy and duodenal ulcer.


xeroderma pigmentosum group A

description: Any xeroderma pigmentosum in which the cause of the disease is a mutation in the XPA gene.


xeroderma pigmentosum group C

description: An autosomal recessive inherited disorder caused by mutations in the XPC gene. This disease is characterized by increased sensitivity to sunlight with the development of carcinomas at an early age and is caused by a defect in nucleotide excision repair.


xeroderma pigmentosum group D

description: Any xeroderma pigmentosum in which the cause of the disease is a mutation in the ERCC2 gene.


xeroderma pigmentosum group E

description: An autosomal recessive genetic disorder caused by mutations in the DDB2 gene. This disease exhibits the mildest degree of sun sensitivity of all xeroderma pigmentosum complementation groups, although individuals are at high risk for skin cancer.


xeroderma pigmentosum variant type

description: Xeroderma pigmentosum variant is a milder subtype of xeroderma pigmentosum (XP), a rare genetic photodermatosis characterized by severe sun sensitivity and an increased risk of skin cancer.


xeroderma pigmentosum group F

description: Any xeroderma pigmentosum in which the cause of the disease is a mutation in the ERCC4 gene.


xeroderma pigmentosum group G

description: Any xeroderma pigmentosum in which the cause of the disease is a mutation in the ERCC5 gene.


de Sanctis-Cacchione syndrome

description: A rare autosomal recessive inherited syndrome. It is characterized by xeroderma pigmentosum, mental retardation, dwarfism, hypogonadism, and neurologic abnormalities.


Young syndrome

description: Young syndrome is characterized by the association of obstructive azoospermia with recurrent sinobronchial infections.


CHIME syndrome

description: CHIME syndrome is a rare ectodermal dysplasia syndrome characterized by ocular colobomas, cardiac defects, ichthyosiform dermatosis, intellectual disability, conductive hearing loss and epilepsy.


X-linked Opitz G/BBB syndrome

description: X-linked form of Opitz G/BBB syndrome.


name: ichthyosis, X-linked, without steroid sulfatase deficiency


name: corpus callosum agenesis-abnormal genitalia syndrome

description: Corpus callosum agenesis-abnormal genitalia syndrome is a rare, genetic developmental defect during embryogenesis syndrome characterized by agenesis of the corpus callosum, mild to severe neurological manifestations (intellectual disability, developmental delay, epilepsy, dystonia), and urogenital anomalies (hypospadias, cryptorchidism, renal dysplasia, ambiguous genitalia). Additionally, skeletal anomalies (limb contractures, scoliosis), dysmorphic facial features (large eyes, prominent supraorbital ridges, synophris) and optic atrophy have been observed.


Dent disease type 1

description: Dent disease type 1 is a type of Dent disease with predominantly renal manifestations.


retinitis pigmentosa 3

description: Any retinitis pigmentosa in which the cause of the disease is a mutation in the RPGR gene.


alopecia, congenital

description: A congenital condition characterized by the absence of hair on the scalp or entire body. The lack of hair is rarely absolute and is usually accompanied by incompletely grown, lanugo-like hair. It affects males twice as much as females and a familial tendency is common.


name: intestinal pseudoobstruction, neuronal, chronic idiopathic, X-linked

description: Intestinal pseudo-obstruction is a condition characterized by impairment of the muscle contractions that move food through the digestive tract. The condition may arise from abnormalities of the gastrointestinal muscles themselves (myogenic) or from problems with the nerves that control the muscle contractions (neurogenic). When intestinal pseudo-obstruction occurs by itself, it is called primary or idiopathic (unknown cause) intestinal pseudo-obstruction. The disorder can also develop as a complication of another medical condition; in these cases, it is called secondary intestinal pseudo-obstruction. Individuals with this condition have symptoms that resemble those of an intestinal blockage (obstruction) but without any obstruction. It may be acute or chronic and is characterized by the presence of dilation of the bowel on imaging. The causes may be unknown or due to alterations (mutations) in the FLNA gene, other genes or are secondary to other conditions. It may be inherited in some cases. Intestinal pseudoobstruction neuronal chronic idiopathic X-linked is caused by alterations (mutations) in the FLNA gene which is located in the X chromosome. There is no specific treatment but several medications and procedures may be used to treat the symptoms.


name: heterotopia, periventricular, X-linked dominant


name: X-linked intellectual disability-psychosis-macroorchidism syndrome


description: X-linked intellectual disability-plagiocephaly syndrome is characterized by severe intellectual deficit, brachycephaly, plagiocephaly, prominent forehead and coarse facial features. It has been described in two males from one family. Two females belonging to the same family displayed moderate intellectual deficit but no craniofacial dysmorphism.


hearing loss, X-linked 4

description: Any X-linked nonsyndromic deafness in which the cause of the disease is a mutation in the SMPX gene.


name: lissencephaly type 1 due to doublecortin gene mutation

description: Type 1 lissencephaly due to doublecortin (DCX) gene mutations is a semi-dominant X-linked disease characterized by intellectual deficiency and seizures that are more severe in male patients.


name: congenital stationary night blindness 2A

description: Any congenital stationary night blindness in which the cause of the disease is a mutation in the CACNA1F gene.


X-linked immunoneurologic disorder

description: X-linked immunoneurologic disorder is characterized by immune deficiency and neurological disorders in females, and by neonatal death in males.


name: developmental and epileptic encephalopathy, 9

description: Female restricted epilepsy with intellectual disability is a rare X-linked epilepsy syndrome characterized by febrile or afebrile seizures (mainly tonic-clonic, but also absence, myoclonic, and atonic) starting in the first years of life and, in most cases, developmental delay and intellectual disability of variable severity. Behavioral disturbances (e.g. autistic features, hyperactivity, and aggressiveness) are also frequently associated. This disease affects exclusively females, with male carriers being unaffected, despite an X-linked inheritance.


X-linked cerebral adrenoleukodystrophy

description: A peroxisomal disease characterized by severe inflammatory demyelination in the brain, and often associated with adrenal insufficiency.


description: X-linked form of spondyloepimetaphyseal dysplasia.


name: intellectual disability, X-linked, with panhypopituitarism


name: migraine, familial typical, susceptibility to, 2


name: diabetes mellitus, insulin-dependent, X-linked, susceptibility to


intellectual disability, X-linked 21

description: Any non-syndromic X-linked intellectual disability in which the cause of the disease is a mutation in the IL1RAPL1 gene.


MEHMO syndrome

description: MEHMO syndrome is characterized by severe intellectual deficit, epilepsy, microcephaly, hypogenitalism, and obesity. Growth delay and diabetes are also present. To date, it has been described in seven boys, all of whom died within the first two years of life. The causative gene has been localized to the 21.1-22.13p region of the X chromosome and the syndrome appears to result from mitochondrial dysfunction.


retinitis pigmentosa 24

description: A retinitis pigmentosa that has material basis in variation in the chromosome region Xq26-q27.


name: arthrogryposis, congenital, lower limb, X-linked


name: hypotonia, congenital nystagmus, ataxia, and abnormal auditory brainstem responses


name: Alport syndrome-intellectual disability-midface hypoplasia-elliptocytosis syndrome


X-linked adrenal hypoplasia congenita

description: A X-linked condition characterized by underdevelopment of the adrenal gland and adrenal insufficiency caused by mutation(s) in the NR0B1 gene, resulting in decreased activity of the nuclear receptor protein DAX1, which may be associated with hypogonadotropic hypogonadism.


Simpson-Golabi-Behmel syndrome type 2

description: Simpson-Golabi-Behmel syndrome (SGBS) type 2 is an extremely rare and severe, early-lethal form of SGBS, an overgrowth-multiple anomalies syndrome, characterized by hydrops fetalis, macrocephaly, facial dysmorphism (hypertelorism, low-set, posteriorly angulated ears, short and broad nose with anteverted nares, prominent philtrum, large mouth with thin upper vermilion border, high-arched and cleft palate), short neck, redundant skin, skeletal defects (involving upper and lower limbs), hypoplastic nails, gastrointestinal and genitourinary anomalies, hypotonia and neurologic impairment. Severe intellectual disability, obesity and infections (pneumonia, sepsis) have been reported.


intellectual disability, X-linked 58

description: Any non-syndromic X-linked intellectual disability in which the cause of the disease is a mutation in the TSPAN7 gene.


description: X-linked lissencephaly with abnormal genitalia (XLAG) is a severe neurological disorder that only manifests in genotypic males and includes lissencephaly with posterior-to-anterior gradient and only moderate increase in thickness of the cortex, absent corpus callosum, neonatal-onset severe epilepsy, hypothalamic dysfunction including defective temperature regulation, and ambiguous genitalia with micropenis and cryptorchidism. XLAG differs considerably from classical lissencephaly, as the resulting cortical thickness is only 6-7 mm in XLAG, rather than 15-20 mm seen in classical lissencephaly due to mutations of the PAFAH1B1 or DCX genes. In 2002, mutations in the X-linked aristaless-related homeobox gene (ARX ; Xp21.3) were identified in individuals with XLAG and in some of their female relatives. Mouse Arx and human ARX are highly expressed in both dorsal and ventral telencephalon, including the neocortical ventricular zone and germinal zone of the ganglionic eminence, with less intense signals in the subventricular zone, cortical plate, hippocampus, basal ganglia and ventral thalamus. Arx-deficient mice showed deficient tangential migration and abnormal differentiation of GABAergic interneurons in the ganglionic eminence and neocortex, as well as abnormal testicular differentiation. These characteristics include some of the clinical features of XLAG in humans. The ARX mutations in XLAG patients were predominantly premature termination mutations (large deletions, frameshift, nonsense mutations, splice site mutations) while the missense mutations were less common and located essentially in the homeobox domain. Patients carrying nonconservative missense mutations within the homeobox, showed less severe XLAG, while conservative substitution in the homeodomain caused Proud syndrome (ACC with abnormal genitalia). A non conservative missense mutation near the C-terminal aristaless domain caused unusually severe XLAG with microcephaly and mild cerebellar hypoplasia. The ARX mutations are also associated with a spectrum of milder phenotypes, without macroscopic malformations of the brain, such as X-linked infantile spasms, a syndrome featuring mental retardation associated with distal dystonic movements (Partington syndrome), autistic features and nonsyndromicintellectual deficit.


Coats disease

description: Coats disease (CD) is an idiopathic disorder characterized by retinal telangiectasia with deposition of intraretinal or subretinal exudates, potentially leading to retinal detachment and unilateral blindness. CD is classically an isolated and unilateral condition affecting otherwise healthy young children.


name: syndromic X-linked intellectual disability 7

description: Syndromic X-linked intellectual disability 7, also called MRXS7, is characterized by X-linked intellectual deficit, obesity, hypogonadism, and tapering fingers.


description: X-linked myotubular myopathy-abnormal genitalia syndrome is a rare chromosomal anomaly, partial deletion of the long arm of chromosome X, characterized by a combination of clinical manifestations of X-linked myotubular myopathy and a 46,XY disorder of sex development. Patients present with severe form of congenital myopathy and abnormal male genitalia.


name: lymphoma, Hodgkin, X-linked pseudoautosomal


name: spondyloepimetaphyseal dysplasia, Bieganski type

description: A rare genetic neurological disorder characterized by the association of hypomyelinating leukodystrophy with spondylometaphyseal dysplasia. Patients present in infancy with absent or delayed ability to walk independently, slowly progressive motor deterioration, spasticity, ataxia, proximal weakness, and joint contractures. Additional manifestations include mild cognitive impairment, short stature, scoliosis, enlarged and deformed joints, dysarthria, nystagmus, visual defects, and mildly dysmorphic features, among others. Mode of inheritance is X-linked recessive.


name: radioulnar synostosis, radial ray abnormalities, and severe malformations in the male


name: syndromic X-linked intellectual disability Shashi type

description: X-linked intellectual disability, Shashi type is characterized by moderate intellectual deficit, obesity, macroorchidism and a characteristic facies (large ears, a prominent lower lip and puffy eyelids). It has been described in nine boys from two families. Transmission is X-linked and the causative gene has been localized to the q21.3-q27 region of the X chromosome.


Christianson syndrome

description: A very rare form of syndromic intellectual deficit characterized by microcephaly, severe developmental delay or regression, hypotonia, abnormal movements, and early-onset seizures.