Acute myelogenous leukemia with eosinophilic differentiation and trisomy-1.

A 50-year-old woman presented with anemia and eosinophilia. Her bone marrow biopsy, peripheral blood, and clinical features were consistent with a diagnosis of an evolving acute myelogenous leukemia. Striking dysplastic eosinophilic differentiation associated with trisomy-1 was evident, and eosinophil granule major basic protein was detected in involved tissue. Trisomy-1 has not been previously reported in association with acute myelogenous leukemia showing eosinophilic differentiation. Intensive cytotoxic chemotherapy produced a short-lived clinical and cytogenetic remission. At autopsy multiple tumor nodules composed of dysplastic eosinophil precursors and myeloblasts were evident in multiple organs.