label: PIK3CA-Related Overgrowth Spectrum
label_lc: pik3ca-related overgrowth spectrum
description: A group of rare disorders that are usually caused by somatic mutations in the PIK3CA gene, but may rarely be caused by de novo germline mutations. These disorders are typically characterized by sporadic overgrowth of parts of the body, intellectual disability, low muscle tone, and vascular malformations with congenital or early childhood onset. Representative examples include: fibroadipose hyperplasia, CLOVES syndrome, megalencephaly-capillary malformation syndrome, hemihyperplasia-multiple lipomatosis syndrome, hemimegalencephaly, and facial infiltrating lipomatosis.