We report a patient with hypereosinophilic syndrome (HES), which, 8 years later, transformed into granulocytic sarcoma in the brain and, subsequently, into acute myelocytic leukaemia. Repeated chromosome analyses showed a normal karyotype, until the time of leukaemic transformation when trisomy 8 was confirmed in cells from the bone marrow and cerebrospinal fluid. The combined techniques of May-Grunwald-Giemsa staining and fluorescence in situ hybridization identified trisomy 8 not only in blasts and eosinophils but also in neutrophils and erythroblasts. Our observation suggests that HES is a multilineage myeloproliferative disorder involving precursors of at least the eosinophil, neutrophil and erythroid lineages.
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