SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Coloured barium enema X-ray (front view) of the abdomen of a patient, showing spastic colon (irritable bowel syndrome). At left, the expanded colon (large intestine) is normal, while at upper centre and right, the colon is narrow due to the spasmodic effect of this condition.
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