Dark-stained colon

Dark-stained colon

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Credit: DAVID M. MARTIN, MD/SCIENCE PHOTO LIBRARY

Caption: Stained colon. Endoscope view of a dark patch (upper right) in the colon, called melanosis coli, caused by prolonged use of laxative drugs to treat constipation. The drugs contained anthracene, a pigment extracted from coal tar. Melanosis coli is usually asymptomatic and harmless.

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Keywords: anthracene, colonic, condition, diagnosis, diagnostic, digestive system, disease, disorder, endoscope, endoscopy, healthcare, intestinal, large intestine, laxatives, medical, medicine, melanosis coli, stained, tract

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