MICHEL BRAUNER / ISM / SCIENCE PHOTO LIBRARY MICHEL BRAUNER / ISM / SCIENCE PHOTO LIBRARY
Diverticulosis. Coloured axial computed tomography (CT) scan of the abdomen of a patient with several diverticula (small dark blue spots) on the sigmoid colon, the final part of the large bowel before the rectum and anus. A diverticulum is a small pouch-like structure that protrudes out of weak spots in the intestinal wall. Diverticula are thought to be caused by a low-fibre diet and lack of exercise. In most cases diverticula are symptomless and cause no problems. Occasionally they can become inflamed and infected, a condition called diverticulitis, causing abdominal pain and constipation.
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