JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
Illustration of colonoscopy and polyps, tissue growth inside the colon. Some polyps are benign, but some can be cancerous, or lead to cancer. There are four distinct types of polyps, but the most common types are Adenomatous and Hyperplastic types. Polyps can be removed during a colonoscopy.
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