ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Intestinal polyp. Coloured virtual colonoscopy (VC) image of a pedunculated (stalked) polyp in the transverse colon of the large intestine of a 57-year-old patient. A VC is constructed from 3D CT (computed tomography) scans and is used to diagnose bowel disease. Polyps are benign (non-cancerous) growths that arise from mucous membranes. Although benign, polyps are generally removed surgically as their growth may obstruct the passage of food, and some polyps may turn cancerous over time.
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