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A new study shows an examination of the entire colon with a screening method known as colonoscopy detects cancers and precancerous polyps that may be missed with flexible sigmoidoscopy, a test that examines less than half of the colon.
http://www.cancer.org/
Definition of virtual colonoscopy.
http://www.bocaradiology.com/Procedures/colonoscopy/
A comparison of virtual and conventional colonoscopy for the detection of colorectal polyps.
http://content.nejm.org/cgi/content/short/341/20/1496