Leukemic blasts in the majority of cases shared unique morphologic features ( deeply invaginated nuclear membranes , scant cytoplasm with fine azurophilic granularity , and finely granular Sudan black B and myeloperoxidase cytochemical reactivity ) that were remarkably similar to those of acute promyelocytic leukemia ( APL ) ; particularly the microgranular variant ( FAB AML -M3v ) .
leukemic blasts in the majority of cases shared unique morphologic features ( deeply invaginated nuclear membranes , scant cytoplasm with fine azurophilic granularity , and finely granular sudan black b and myeloperoxidase cytochemical reactivity ) that were remarkably similar to those of acute promyelocytic leukemia ( apl ) ; particularly the microgranular variant ( fab aml -m3v ) .
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