A focal area of ulcerative colitis is appreciated, showing redness and ulcerations. A pit-pattern classification has been developed based upon the staining pattern, which allows endoscopic prediction of histopathologic findings with an accuracy of 93%: Type I and II staining patterns are consistent with nonneoplastic lesions, and types III through V predict neoplastic lesions. Chromoendoscopy can increase the yield of neoplastic lesions detected in ulcerative colitis by 3- to 4.5-fold as compared with conventional colonoscopy.
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