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Granulocytic sarcoma of testis preceding acute myelocytic leukemia.

A unique case of granulocytic sarcoma of the testis as a first manifestation of acute myelocytic leukemia preceding hematologic pathology is reported. The testicular specimen was identified by immunoperoxidase staining to be composed of immature granulocytes. Acute myelocytic leukemia of which the first manifestation is a primary testicular tumor is extremely rare, and the related literature is reviewed.