BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Crohn's disease. Coloured X-ray showing the colon of a patient suffering from Crohn's disease. Crohn's disease is a chronic inflammatory disease of unknown cause that usually affects the small intestine, but in this case involves the colon. The spine, down the centre, and the pelvis, at lower frame, are coloured blue. At centre is healthy small intestine tissue. Crohn's disease is seen as pock-marking on the colon at upper left and upper centre. The affected areas are darker because of ulceration and internal scarring. X-ray opaque barium sulphate is used to highlight the soft tissue of the colon and small intestine.
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