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Fig. 11C —Noncolorectal gastrointestinal lesions seen in asymptomatic adults undergoing routine screening. Unenhanced transverse CT image (A) in 65-year-old woman shows small, subcentimeter soft-tissue lesion involving distal ileum (arrow). Volume-rendered 3D endoluminal image from CT colonography (B) and digital photograph from optical colonoscopy (C) show same lesion, which proved to be carcinoid tumor. We do not routinely perform 3D fly-through of distal ileum at CT colonography.