A colonoscopy is a medical procedure that uses a long, flexible and lighted video instrument (a colonscope) to visually inspect the rectum and large intestine for the polyps that can cause colorectal cancer. If a suspicious polyp is found, it can be removed through the colonscope for further testing. This test can also be used to check for other diseases of the bowel, such as ulcerative colitis and Crohn’s disease.

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