Crohn's disease causes inflammation that extends much deeper into the layers of the intestinal wall and generally tends to involve the entire bowel wall, whereas ulcerative colitis affects only the lining of the bowel.
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A noninvasive diagnostic imaging procedure that uses a combination of X-rays and computer technology to produce horizontal, or axial, images often called slices of the body to detect any abnormalities that may not show up on an ordinary X-ray.