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Mixed phenotype leukemia (MPAL) is a rare type of acute leukemia with blasts that co-express antigens of more than one lineage on the same cell or that have separate populations of blasts of different lineages. Here, we report a five-year-old male with inguinal lymphadenopathy diagnosed with MPAL-T/Myeloid MPAL-T/M. The clone demonstrated lineage and immunophenotypically distinct blast populations in the bone marrow and lymph nodes. Bone marrow cytogenetic studies confirmed a rare  PICALM::MLLT10  gene fusion. Patients with this fusion gene have been found to have high risk features and poor survival rates in several small case series. Our case report highlights an unusual presentation in medullary and extramedullary sites, within a pediatric patient. At the time of submission of this case report, the patient has shown good response to chemotherapy and continues to be in remission.

An unusual presentation of a pediatric patient with mixed phenotypic acute leukemia with PICALM::MLLT10 gene rearrangement