A 45-years-old man presented discharge of abscess from the umbilicus with lower abdominal pain. CT scan showed huge tumor from the bladder to the umbilical part with sigmoid colon invasion. He was diagnosed as urachal carcinoma, which was confirmed by pathological examination. We started FOLFOX chemotherapy according to advanced colon cancer. Approximately 80% of reduction was accomplished after 11 courses of FOLFOX. We performed radical cystectomy with sigmoid colon resection. Pathological examination revealed complete resection with negative surgical margin. No recurrence and metastasis were observed after 30 months of surgery. Urachal carcinoma is often advanced cancer when diagnosed. Effective chemotherapy is not established well. FOLFOX chemotherapy demonstrated the well antitumor effect in this case.
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