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Fig. 1B —Screening CT colonography (CTC) in asymptomatic average-risk 54-year-old man. Endoluminal 3D CTC image shows 10-mm ovoid, sessile polyp (asterisk), which extends off edge of fold. Lesion was obvious at real-time 3D fly-through evaluation, confirmed on secondary 2D correlation, and given highest diagnostic confidence score by interpreting radiologist.