[Acute myeloid leukemia diagnosed with soft tissue mass in the right thigh].

Myeloid sarcoma is a very rare solid tumor which frequently accompanies myeloproliferative disorders and consists of immature myeloid cells. A 47-year-old male patient admitted to our clinic with complaints of swelling and pain in the right thigh. After diagnosis of myeloid sarcoma was made with tru-cut biopsy, acute myeloid leukemia was diagnosed by hematology clinic as a result of peripheral smear and bone marrow biopsy. No surgical intervention was performed. Patient was treated with chemotherapy for acute myeloid leukemia, and allogeneic bone marrow transplantation. In the follow-up period, patient was asymptomatic at 14 months and magnetic resonance imaging showed almost complete regression of the tumor.