Fig. 9From: CT colonography: avoiding traps and pitfallsa Three-dimensional view of the sigmoid in a patient with dolichocolon: image suggestive of large polypoid mass (black arrowhead). b Corresponding sagittal view in an abdominal window setting showing an acute flexure of the sigmoid over 180° with thickening of the colonic wall and compression of the inner structures. c The corresponding 3D view in the prone position shows a normal foldBack to article page