Fig. 7
From: Electronic cleansing of tagged residue in CT colonography: what radiologists need to know
Pseudopolyp at the right colonic flexure due to trapped gas bubbles after EC. a In an endoluminal 3D view after EC, an oval filling defect is visible, simulating a sessile polyp (arrow). b In the corresponding 2D image after EC, a gas-filled cyst with a thin wall is seen (arrow). c In the unsubtracted 2D image, the round lesion correlates with a gas bubble trapped between two semilunar folds (arrow)