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Granulocytic sarcoma (GS) is a rare extramedullary solid tumor composed of immature myeloid cell that is associated with acute myeloid leukemia or myelodysplastic syndrome. Especially, the involvement of the breast as a pattern of relapse after allogeneic bone marrow transplantation (allo SCT) is extremely rare. We report the case of a 57-year-old woman who palpated a painless lump in the superior quadrant of her right breast. Her past medical history was a myelodysplastic syndrome (MDS) treated with bone marrow transplantation. Imaging work-up by mammogram and ultrasonography (US) showed solitary mass suspect of malignancy in breast. Trucut biopsy was performed from the suspect palpable mass of the right breast. Histologic findings were compatible with a granulocytic sarcoma in breast. While she was also evaluated for mass in the breast, also investigated by endoscopy for the symptoms of gastrointestinal system. The endoscopic biopsy showed diffuse neoplastic infiltration similar the pathology of the breast. GS of the breast is a rare extramedullary involvement of hematologic diseases. There are no the specific radyologic features in the presentation with GS of the breast. Our case also showed that careful histopathological review along with all panel of immunohistochemistry is extremely important for diagnose.  Keywords: myelodysplastic syndrome; granulocytic sarcoma; allogeneic bone marrow transplantation.

Granulocytic sarcoma with unusual localizations (breast and stomach) without bone marrow involvement after the allogeneic transplantation