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Fig. 6C —Difficult polyp location for detection and polypectomy with optical
colonoscopy in 68-year-old woman. Three-dimensional colonic map shows anatomic
location of cecal polyp (red dot), extensive sigmoid diverticulosis,
and automated centerline (green). Blue arrow indicates 3D vantage
point shown in A. Polyp was found and removed at optical colonoscopy
and proved to be tubulovillous adenoma with high-grade dysplasia. Because of
difficult location of polyp, gastroenterologist noted that he would have
missed this lesion without detailed knowledge of its existence obtained with
CT colonography.
