MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Colon cancer. Coloured barium X-ray showing cancer of the human colon (large intestine). The cancerous area, at lower centre, has a wrinkled (dimpled) appearance. Opaque to X-rays, barium is given rectally (barium enema) to examine the rectum and colon. The barium coats the intestine's inside wall and shows up strongly on the X-ray film. The colon is one of the most common cancer sites. Treatment in most cases is by a partial colectomy (removal of part of the colon). Over fifty percent of patients survive for five years or more after a colectomy.
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