Virtual colonoscopy, which is an electronic reconstruction of the colon from high-resolution abdominal computed tomographic (CT) scans or magnetic resonance imaging (MRI) studies, holds promise as a colon-screening tool. Current technology has already resulted in reliable identification of colonic lesions as small as a few millimetres. Complete colon preparation is still required, and the cost is not yet known. Research is under way to assess the potential of doing virtual colon studies without any preparation. If this succeeds, screening may well become both cost-effective and convenient. The utility of capsule endoscopy small-bowel surveillance in patients with polyposis  might find an indication in selected cases of more advanced duodenal adenoma that can be related to the presence of small-bowel polyps.
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