Computerized tomographic (CT) colography is an exciting technique whereby images of the colonic wall and lumen can be obtained without colonoscopy. It is not as good as conventional colonoscopy, however, because of both inherent and performance limitations. Among the former is the inability to visualize @entity3137 , such as alterations in colour or pliability. More importantly, CT colography is strictly a diagnostic technique, and does not allow biopsy or removal of @entity1127 . The vigorous bowel preparation required for this procedure can be very unpleasant for the @entity1 , and includes purgatives followed by distension of the colon with air. Unlike with colonoscopy, adherent stool can be difficult to distinguish radiologically from @entity1127 or @entity5 ; as a result, many @entity1 require colonoscopy anyway. The major performance limitations of CT colography are poor sensitivity and specificity compared with conventional colonoscopy. @entity75 , flat @entity652 and diminutive @entity652 are especially difficult to detect, and false-positive results are also common. In addition, the procedure is expensive and less cost effective than colonoscopy. CT colography takes relatively little @entity1 time, but a substantial amount of time is needed for the radiologist to interpret the images. Interobserver variability is high. For all of these reasons, CT colography cannot be recommended as a screening test for @entity14 .

Motion - computerized tomographic colography is a better method for screening for XXXX : arguments against the motion.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity1127 :: ('MESH:D011127', 'Disease') :: ['polyps'] @entity5 :: ('MESH:D009369', 'Disease') :: ['cancers'] @entity75 :: ('MESH:D001927', 'Disease') :: ['Rectal lesions'] @entity14 :: ('MESH:D015179', 'Disease') :: ['colorectal neoplasia'] @entity652 :: ('MESH:D000236', 'Disease') :: ['adenomas'] @entity3137 :: ('MESH:D009059', 'Disease') :: ['subtle mucosal lesions']
@entity1127 :: (MESH:D011127,Disease) :: ['polyps']
