[A Case of Sigmoid Colon Cancer Derived from Diverticula].

An 88‒year‒old woman visited the gynecology department of our hospital with a chief complaint of frequent urination and abdominal mass. Contrast‒enhanced CT and MRI scans of the abdomen revealed an 8 cm‒sized irregularly shaped mass in widely contact with sigmoid colon and perforated to the bladder. Colonoscopy could not reach the tumor because of huge mass. The diagnosis was resectable pelvic tumor without distant metastasis, and surgery was performed. The tumor was resected en bloc with sigmoidectomy, hysterectomy and partial cystectomy. The majority of the tumor was in the bladder lumen and appeared to be of bladder origin, but final histopathology led to a diagnosis of mucous carcinoma from a diverticulum in the sigmoid colon. Eighteen months after surgery, the patient is alive without recurrence.