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Fig. 1 —Main findings and disposition of 1,015 consecutive
asymptomatic average-risk patients who underwent screening CTC at a Korean
institution over 2-year period. CTC = CT colonography, OC = optical
colonoscopy, CO = inadequate study that would potentially miss polyp 
10
mm, C1 = no significant polyp, C2 = one or two 6- to 9-mm polyps, C3 = polyps
10 mm or 3 polyps 6- to 9-mm, C4 = malignant-appearing mass.
