Normal colon. Barium X-ray showing a healthy colon (white). Barium is radio-opaque and therefore shows up as white on an X-ray. The patient drinks a b


Normal colon. Barium X-ray showing a healthy colon (white). Barium is radio-opaque and therefore shows up as white on an X-ray. The patient drinks a barium-containing liquid before the X-ray.


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Photo credit: © GJLP/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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