Auer rod


Auer rod

A pink, round or rod-shaped, splinter- or “jackstraw”-like inclusion seen in the cytoplasm of lymphoblasts in immature granulocytes, and occasionally in monocyte precursors in the peripheral circulation of 10% to 30% of patients with acute non-lymphocytic leukaemias and acute promyelocytic leukaemia. ARs correspond to azurophilic granules with dysplastic lysosomes; cells with multiple AR bundles are known as faggot cells.