An 82-year-old man who underwent colonoscopy for iron-deficiency anemia was found to have a 15-mm polyp (Paris 0-IIa, type II NICE classification) involving the entire circumferential of the diverticulum in the distal descending colon. Biopsy specimens from this polyp revealed tubular adenoma with high-grade dysplasia. He was referred for endoscopic resection of this polyp (Video 1, available online at www.VideoGIE.org ).