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Acute monoblastic leukemia with a single chromosomal rearrangement involving breakpoints on chromosomes 8 and 16, 46, XX, t(8;16)(p11;p13).

We report a case of acute nonlymphoblastic leukemia (M5) with a rare cytogenetic abnormality involving chromosomes 8 and 16, t(8;16)(p11;p13). The leukemic blasts were determined to be monocytic by cytochemical and immunochemical studies. Morphological changes of the leukemic cells in response to phorbol myristate acetate further supported their identification as monocytic in nature. This chromosomal abnormality has apparently been reported only thrice in the literature. Translocation (8;16)(p11;p13), though rare, may be of primary importance in the process of leukemogenesis in some cases of histiocytic/monocytic malignancies.