FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY
Colon polyp, endoscope view. This is a sessile polyp. Polyps are benign growths. They can be flat (sessile) or on a stalk (pedunculated). If they turn cancerous, or grow large enough to obstruct the colon, they are surgically removed.
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