Myeloid Sarcoma of the Breast of A Young Boy: A Case Report

Granulocytic sarcoma also called myeloid sarcoma (MS) is an extramedullary tumour of immature granulocytic cells. It is a rare entity and most frequently associated with acute myeloid leukaemia (AML) but can occur with other myeloproliferative disorders. It may occur at any site, leading to very varied clinical presentations. Although it can occur in a number of areas of the body, the involvement of the breast is uncommon. We present a rare case of MS in a 14?year?old boy with a non-tender lump in the left breast that had been apparent for five months. Available diagnostic techniques, including ultrasound and magnetic resonance imaging were systematically performed. After mastectomy, biopsy and immunohistochemistry was done. Immuno-histochemical stains were positive for CD45 (haematological marker) and myeloid markers, such as myeloperoxidase (MPO), and CD68, CD43 suggesting the diagnosis of MS. Although MS is a rare tumour in breast and its diagnosis is usually difficult, the clinician must know about its existence to make differential diagnosis.