How a virtual colonoscopy is different

A virtual colonoscopy, also called CT colonography, uses computerized tomography (CT) imaging to create detailed pictures of the colon and rectum. This test can detect many of the same findings, such as polyps, growths or narrowing, but it does not allow tissue removal or biopsy during the same exam.

If a virtual colonoscopy shows anything irregular, a standard colonoscopy is usually needed to confirm the findings and remove any polyps for testing.