DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY
Colonic polyp. Colonoscope (endoscope) view of a benign (non-cancerous) polyp in a 79 year-old woman's colon (large intestine). This is an sessile adenoma, a tumour arising from the epithelial tissue lining an organ. Unlike more common polyps, which are attached on a stalk, this type (sessile) lies flat on the surface. 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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