An acute monocytic leukemia occurring in children. The disease or phenotype is childhood acute monocytic leukemia (EFO_1001944). Also known as: Childhood Acute Differentiated Monocytic Leukemia (M5b), Childhood Acute M5b Leukemia, Childhood Acute Monocytic Leukemia with Differentiation, M5b Childhood Acute Differentiated Monocytic Leukemia, M5b Pediatric Acute Differentiated Monocytic Leukemia, Pediatric Acute Differentiated Monocytic Leukemia, Pediatric Acute M5b Leukemia, Pediatric Acute Monocytic Leukemia with Differentiation.