Abstract
Colorectal cancers are the 3rd most common type of cancer and 2nd leading cause of cancer death in the United States. Colorectal cancer screening, detects colorectal cancers at an earlier stage, reduces colorectal cancer mortality. Although a variety of colon screening tests such as fecal occult blood testing, double-contrast barium enema, sigmoidoscopy, colonoscopy are available, none is ideal and also they are expensive, invasive and not easily tolerable techniques. Virtual colonoscopy and computed tomographic colonography are promising to be the primary, non-invasive method of screening of colorectal cancers.
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