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Crohn's disease. Coloured X-ray of the colon (large intestine, brown/purple) of a patient with Crohn's disease. This affects the alimentary canal, resulting in inflammation and ulcers, which gives the colon a ragged appearance, as in the transverse colon (purple). Crohn's disease usually affects the end part of the alimentary canal, resulting in abdominal pain and diarrhoea. The cause is unknown, but is thought to be connected with an infectious agent. Treatment includes rest, changes to the diet and antibiotic and steroid drugs. In severe cases, the affected parts of the intestine may be surgically removed.
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