(A) Adenoma in the rectum shown with the colonoscope in retroflexion. The right margins of the adenoma are well demarcated using high-definition white-light endoscopy (arrowheads). (B) The same polyp seen using blue light (narrow band imaging). The use of blue light enhances differences between polyp and normal mucosa. (C) Following endoscopic resection, a clean resection margin is seen using high-definition white-light endoscopy. A hemostatic clip (arrow) was placed on a visible non-bleeding vessel.
