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Polyps and Colon Cancer Risk

A polyp is a projecting mass of overgrown tissue. It looks a lot like an inflated balloon, with the part you tie off attached to wherever it's growing from. Most colon cancer develops from polyps.
Colon Polyps and Cancer Risk
Virtually all colon cancer develops from adenomatous polyps in the colon, generally referred to simply as colon polyps. Although polyps don't always become cancerous, a personal or family history of polyps puts you at higher risk for colon cancer.
Polyp Size Gallery
This gallery of polyp illustrations is designed to let you see what polyps look like and how big they are in real life. Looking at them this way helps demonstrate why you can't count on noticing that a polyp is present.
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