Myelodysplastic changes in a cat with myelomonocytic leukemia

A cat had clinical and pathologic features similar to those of human subacute myelomonocytic leukemia. Studies involved cytologic, histologic, and cytochemical techniques. Findings included macrocytic nonregenerative anemia, monocytosis, thrombocytopenia, hyperproliferative bone marrow, and myelodysplasia typified by hypersegmented neutrophils and micromegakaryocytes.