SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Intussusception of the intestines of an infant, barium enema X-ray. Intussusception (centre left) is a condition in which part of the intestines telescopes into an adjacent part. It causes abdominal pain, nausea and bleeding from the rectum, and the condition is fatal if not corrected. In most cases, introducing a barium enema, a solution of barium salts that is opaque to X-rays, can both diagnose and treat the condition. However it can recur, and surgical correction is then required.
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