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Sigmoid colon cancer arising in a diverticulum of the colon with involvement of the urinary bladder: A case report and review of the literature

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Abstract

Background: Colon cancer can arise from the mucosa in a colonic diverticulum. Although colon diverticulum is a common disease, few cases have been previously reported on colon cancer associated with a diverticulum. We report a rare case of sigmoid colon cancer arising in a diverticulum with involvement of the urinary bladder, which presented characteristic radiographic images.Case presentation: A 73-year-old man was admitted to our hospital for macroscopic hematuria. Computed tomography and magnetic resonance imaging revealed a sigmoid colon tumor that protruded into the urinary bladder lumen. The radiographs showed a tumor with a characteristic dumbbell-shaped appearance. Colonoscopy showed a type 1 cancer and multiple diverticula in the sigmoid colon. A diagnosis of sigmoid colon cancer with involvement of the urinary bladder was made based on the pathological findings of the biopsied specimens. We performed sigmoidectomy and total resection of the urinary bladder with colostomy and urinary tract diversion. Histopathological findings showed the presence of a colovesical fistula due to extramurally growing colon cancer. Around the colon cancer, the normal colon mucosa was depressed sharply with lack of the muscular layer, suggesting that the colon cancer was arising from a colon diverticulum.Conclusion: The present case is the first report of sigmoid colon cancer arising in a diverticulum with involvement of the urinary bladder. Due to an accurate preoperative radiological diagnosis, we were able to successfully perform a curative resection for sigmoid colon cancer arising in a diverticulum with involvement of the urinary bladder. © 2014 Yagi et al.; licensee BioMed Central Ltd.

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Yagi, Y., Shoji, Y., Sasaki, S., Yoshikawa, A., Tsukioka, Y., Fukushima, W., … Saito, K. (2014). Sigmoid colon cancer arising in a diverticulum of the colon with involvement of the urinary bladder: A case report and review of the literature. BMC Gastroenterology, 14(1). https://doi.org/10.1186/1471-230X-14-90

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