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These polyps possess discrete stalks and occasionally can be observed "en face" hanging from the nondependent wall of the colon on double contrast barium enemas.
Plus, two of the other three screening tests for colon cancer (flexible sigmoidoscopy and double contrast barium enema) also require a bowel prep and neither is as sensitive as the colonoscopy.
The double contrast cases include two pairs of alternatives, for example, John slept, but Bill watched TV.
Other screening methods available include double contrast barium enema and colonoscopy.