Multicentric granulocytic sarcoma of the breast: mammographic, sonographic, and MR findings

A rare case of granulocytic sarcoma (GS) of the bilateral breasts after complete remission of acute myelogenous leukemia is reported. Mammogram showed multiple irregular high-density masses, and sonogram demonstrated multiple irregular low-echoic masses with a posterior shadow in the bilateral mammary glands. Contrast-enhanced MR images showed multiple irregular enhancing masses. None of those findings were pathognomonic of GS. However, MR image was useful to evaluate the response of the chemotherapy and detect the nonpalpable relapse tumor and determine the introduction of the radiation therapy early.