Fig. 5From: Electronic cleansing of tagged residue in CT colonography: what radiologists need to knowA pseudopolyp at the interface between tagged residue and air in the descending colon. a Endoluminal 3D and (b) axial 2D view after EC, showing irregular pseudopolypoid filling defects (arrow), visible at the interface between tagged residues and air. On corresponding unsubtracted (c) 3D and (d) 2D views, no lesion is seenBack to article page