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Blasts in bone marrow cytology

Blasts in bone marrow cytology

In the peripheral blood of a 71-year old patient only pancytopenia was observed, but no blast cells. In the bone marrow cytology shown here (May-Grünwald-Giemsa stain) 43% blasts were detected leading to the diagnosis of acute leukaemia. The peroxidase and esterase stain demonstrated an FAB AML M2. The further classification according to WHO is mandatory and was obtained by cytogenetic and molecular techniques.