Colonic polyp. Colonoscope (endoscope) view of a benign (non-cancerous) polyp in the sigmoid colon (the final part of large intestine which joins the rectum). This polyp is a pedunculated tubular adenoma, a tumour with a stalk, arising from the epithelial tissue lining an organ. In this case there is a long stalk (right of image). If the polyp causes discomfort, for instance by obstructing the flow of food along the intestine, it is removed surgically. Some types of polyp may turn cancerous, and are removed as soon as they are discovered.
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