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Fig. 3. —Axial CT colonographic scan obtained in group 2 patient shows tiny amount of untagged fecal residue (arrowheads) in descending colon, resulting in low average labeling score of 21%. However, colonic wall could be adequately examined. No lesions were detected. This finding was confirmed on conventional colonoscopy. Very good tagging is seen in ascending and transverse segments of colon (arrows).