Myeloid Sarcoma of the Breast Mimicking Hamartoma on Sonography

Myeloid sarcoma, also known as granulocytic sarcoma, chloroma, and extramedullary myeloblastoma, is a neoplasm of myeloblasts or immature myeloid cells that occurs at an extramedullary site. Although these tumors can involve any part of the body, common sites of involvement are bone, periosteum, lymph nodes, skin, and soft tissue. 1 Myeloid sarcoma involving the breast is uncommon. To our knowledge, there have been a few reports on sonographic findings of myeloid sarcoma of the breast in patients with acute myeloid leukemia. Although the sonographic findings that have been reported are not specific for myeloid sarcoma, there were suspicious findings of irregular hypoechoic masses in previous reports. 2-6 We report a case of myeloid sarcoma involving the breast with radiologic findings mimicking hamartoma on sonography.