Acute myelomonocytic leukemia (M-4 subtype) with abnormal marrow eosinophilia and a normal chromosome 16.

A variety of chromosome 16 abnormalities, including inversion, deletion, and translocation in patients with acute myelomonocytic leukemia and abnormal marrow eosinophilia have been reported recently. The authors have identified an AMML patient who had a normal karyotype in 50 metaphases. In particular, chromosome 16 was closely examined for abnormality and was found to be entirely normal. In addition, the authors describe new cytochemical and ultrastructural features of the associated abnormal eosinophils.