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B-cell lymphoblastic lymphoma (LBL) is a highly aggressive malignant proliferation of lymphoblasts of B-origin grouped with acute lymphoblastic leukemia. Multiple studies demonstrated the various sites of involvement in adult LBL. The involvement of the uterus as a site of relapse for such disease is rare. We herein report the case of relapsed B-cell LBL mimicking endometrial sarcoma. The patient is a 56-year-old female patient known to have B-cell LBL on chemotherapy. She presented with abdominal pain and fever. Positron emission tomodensitometry-computed tomography showed the presence of a uterine mass with bilateral iliac lymph node involvement. She underwent surgery with mass removal and pathology showed relapsed B-cell LBL.