We present an unusual case of a granulocytic sarcoma (chloroma) of the
sacrum which predated the initial clinical manifestation of acute mye
logenous leukemia. Although granulocytic sarcomas occur in up to 9.1%
of cases of acute myelogenous leukemia they usually present concurrent
ly with the leukemic presentation. Although granulocytic sarcomas can
involve several different organ systems, bone is the most common site.