Acute eosinophilo-myelomonocytic leukaemia, one of the 'in between leukaemias'.

A patient is reported to have an in between type of acute myeloid leukaemia, namely acute eosinophilomyelomonocytic leukaemia. The blasts in the peripheral blood showed a definite transition towards immature monocytes. The bone marrow contained 65% blasts and 13% eosinophil promyelocytes. The large number of immature eosinophils in the bone marrow strongly support the view that they were part of the leukaemic process and not merely a reactive eosinophilia.