Figure 1. Peripheral smear from a patient with microgranular variant of AML-M3 (WHO AML with t('15;17)(q22;q12). The microgranular promyelocyte on the left has the classical bilobed nuclear shape with scant azurophilic granules in the cytoplasm. A faggot cell is shown in the middle with bundles of Auer rods. The promyelocyte on the right has a loculated, cerebriform-like nucleus and a few azurophilic granules.
Figure 3. Bone marrow aspirate from this case shows the spectrum of nuclear shapes characteristic of microgranular AML-M3. Blast cells with high nuclear/cytoplasmic ratios can be seen in the center of the image. Bilobed promyelocytes are scattered throughout thesmear showing variable cytoplasmic granularity. A few promyelocytes have a irregular cerebriform nuclear shape. One of the abnormal promyelcytes shows cytoplasmic vacuolization.