DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY
Stained colon. Colonoscope (endoscope) view of the darkly stained (pigmented) colonic surface of a patient with melanosis coli. This condition is caused by prolonged use (or abuse) of laxative drugs, used to treat constipation. These drugs containe anthracene, a pigment extracted from coal tar. The condition is benign and reversible.
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