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Fig. 11A 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.