Fig. 9
From: Electronic cleansing of tagged residue in CT colonography: what radiologists need to know
Changes in the morphologic appearance of a pedunculated colonic polyp in the sigmoid colon due to EC. a On endoluminal 3D views, a horizontal fluid layer in the descending colon obscures a pedunculated polyp before EC (arrowhead). b On the axial 2D image before EC, the soft tissue lesion is almost completely submerged in hyperdense tagged residues (arrow). c After EC, the polyp head presents with an irregular shape, with a reduced conspicuity on endoluminal 3D views (arrow). d Axial 2D image after EC, showing the soft tissue lesion associated with some linear artefacts (arrow). Note that unsubtracted 2D views are helpful to evaluate this finding