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Fig. 2B —15-mm pedunculated tubular adenoma with high-grade dysplasia of rectum in 38-year-old man. Transverse images of 72-second delay IV contrast-enhanced CT colonography in supine position at wide window setting (width, 1,500 H; level, –400 H) (A) and at soft-tissue window setting (width, 400 H; level, 20 H) (B) show pedunculated lesion (arrow) in rectum. Lesion had highest attenuation value of 173 H among 48 polyps. At blinded review, all four reviewers correctly interpreted polyp.