Colonoscopy is...: ...When a long tube with a camera on the end is inserted into your rectum, then pushed through your entire large intestine so that it can be looked at, examined, and even biopsied if there are signs of disease. It's done for a variety of reasons, but as people age, it becomes an essential screening tool to detect cancers of the colon while they are treatable.
Answered 9/28/2016
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