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A colonoscope can be used for visual inspection of the colon. It generally consists of a fiberoptic camera or a CCD camera attached to a flexible cable that is passed through the anus into the colon. A shorter endoscope can be used to examine just the lower part of the colon (approximately the last 2 feet). This shorter scope is usually flexible like the colonoscope although a rigid scope was more common in the past before the development of the flexible scope. The rigid scope may still be used in some instances by general practitioners who have only infrequent need to conduct such examinations and thus cannot justify the expense of the flexible scope or in instances where only the very last part of the colon is being examined.

It is also possible to visualize the colon through virtual means using computed tomography (CT) or nuclear magnetic resonance (NMR) scans. Barium (barium sulfate) enemas are also used in conjunction with X-ray scans to visualize the colon and diagnose some medical conditions of the colon.

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Q: What is the medical instrument used to visualize the colon?
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