Abnormal Erythroid Cell Proliferation and Myelofibrosis in a Cat

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A cat was presented with severe progressive anemia despite marked erythroblastosis. The cat was negative for feline leukemia virus antigen and feline immunodeficiency virus antibody. Bone marrow cytology revealed an excess of erythroid cells with a predominance of prorubricytes and basophilic rubricytes. No response to immunosuppressive therapy was obtained, and a tentative diagnosis of myelodysplastic syndrome was made. The cat showed a partial response to low-dose cytarabine (20 mg/m² subcutaneously q24), but died 51 days after the first admission. Histopathological examination revealed fibrosis in the bone marrow and marked infiltration of erythroid cells into other organs.