Fig. 13

a Three-dimensional view of the ascending colon in the supine position showing a 9-mm polypoid defect (white arrow). b The corresponding 2D view confirms the probable polyp (white arrow). c However, the prone acquisition reveals a diverticulum at the same location (white arrow). Review of the 2D image in the abdominal window shows a central hypodensity of -100 to 0 HU, consistent with a subtle amount of fat. These two findings confirm the diagnosis of inverted diverticulum