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A 77-year-old woman was admitted to our hospital because of right lower abdominal pain. CT revealed tumors in the ileum and uterine cervix. After a gynecological biopsy of the uterine tumor, we diagnosed Stage Ⅳ diffuse large B-cell lymphoma. We treated her with R-THPCOP chemotherapy. On day 8 after the first chemotherapy, she developed perforated peritonitis, and an emergency partial ileum resection was performed. Histopathologically, viable cells were not found in the resected intestine. Chemotherapy was resumed on postoperative day 21, and she achieved a complete response 8 months after the surgery. Gastrointestinal malignant lymphoma is sometimes reported in cases requiring emergency surgery. Therefore, information sharing between hematologist and surgeon is recommended.