Primary granulocytic sarcoma of the breast: a case report and review of the literature.

Primary granulocytic sarcoma is an uncommon entity that rarely presents in the breast. It is frequently misdiagnosed as carcinoma or lymphoma and a broad panel of immunohistochemical markers including epithelial and haematological markers are essential for an accurate diagnosis. We reviewed all the cases of granulocytic sarcoma reported in the English literature since 1970 and present a new case of granulocytic sarcoma of the breast. Systemic chemotherapy for acute myeloid leukemia (AML) appears to be superior to surgery or radiotherapy. Granulocytic sarcoma should be in the pathologic differential diagnosis of a breast mass.