Over 95 percent of colonic polyps are hyperplastic or adenomatous. Although these two types have some distinctive features on gross appearance, they cannot be reliably distinguished endoscopically. Left panel: a typical small sessile hyperplastic polyp that is less than 5 mm in size. Right panel: a typical pedunculated adenomatous polyp.
Courtesy of James B McGee, MD.
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Normal sigmoid colon
Endoscopic appearance of the normal sigmoid colonic mucosa. The fine vasculature is easily visible, and the surface is shiny and smooth. The folds are of normal thickness.
