TOPICS: Blasts, anemia, thrombocytopenia, neutropenia, acute lymphoblastic leukemia, B-ALL, T-ALL, acute myelogenous leukemia, acute promyelocytic leukemia, acute monocytic leukemia, acute megakaryoblastic leukemia, lymphoblasts, Down syndrome, TdT, CD10, CD19, CD20, chemotherapy, prophylaxis, scrotum, CSF, t(12;21), t(9;22), T-ALL, CD2, CD8, mediastinal mass, dysphagia, dyspnea, stridor, pleural effusion, AML, MPO, Auer rods, t(15;17), retinoic acid receptor, RAR, ATRA, DIC, gums