label: B Lymphoblastic Leukemia/Lymphoma with Intrachromosomal Amplification of Chromosome 21
label_lc: b lymphoblastic leukemia/lymphoma with intrachromosomal amplification of chromosome 21
description: B lymphoblastic leukemia/lymphoma characterized by amplification of a portion of chromosome 21. It usually occurs in children and is associated with an adverse prognosis.