Introduction Colorectal cancer is the second most common cancer in the world [1] and the second leading cause of cancer-related mor- tality[2].Mostcolorectalcancersarethoughttoarisefrompre- cursoradenomatouspolypsinawell-characterizedadenomato carcinoma sequence. Removal of such precursor lesions through screening programs reduces colorectal cancer mortal- ity by 30 to 50% [3,4] Colonoscopy is the preferred method to detect and remove these lesions but there is a recognized miss rate of polyps, estimated to be 16% to 36%, depending on the location and size of the lesion [5,6]. The majority of colorectal cancers that occur post-colonoscopy are believed to arise from lesions missed at the time of endoscopy, rather than from new lesions[7].Endoscopistsmaymisspolypsforseveralreasonsin- cluding

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