What percentage of colonic cancers is out of reach of the flexible sigmoidoscope

What percentage of colonic cancers is out of reach of the flexible sigmoidoscope?

Over the past 4 decades, the distribution of colon cancers has shifted toward the right colon. About 40% to 50% of colonic cancers are out of reach of the flexible sigmoidoscope.

This is why screening for colonic carcinoma requires a total colonic examination, either by colonoscopy or by double-contrast barium enema examination.

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