Fig. 8

a Axial view of the caecum in the supine position showing an 8-mm polyp on the left lateral side (white arrowhead). b The corresponding view in the prone position shows the same defect on the anterior caecal wall, submerged in slightly tagged fluid (white arrowhead). Residual stool with positional shift? c, d There is a rotation of the caecum over 90° as is shown by the different positions of the ileo-caecal valve (white arrowhead) and the terminal ileum (white arrow) in both acquisitions: image of true polyp or pseudo-stool due to segmental mobility