label: B Lymphoblastic Leukemia/Lymphoma
label_lc: b lymphoblastic leukemia/lymphoma
description: "A neoplasm of lymphoblasts committed to the B-cell lineage, typically composed of small to medium-sized blast cells.  When the neoplasm involves predominantly the bone marrow and the peripheral blood, it is called B acute lymphoblastic leukemia.  When it involves nodal or extranodal sites, it is called B lymphoblastic lymphoma. (WHO, 2001)"