Fig. 1

Images of barium enema examination. a: Wall rigidity under the profile view at the lesion in the sigmoid colon is absent (arrow). Values of horizontal and vertical rigidities are 0 mm. b: The enface view. There is a lesion of the protruding type in the sigmoid colon (arrow). c: The oblique view. The lesion in Fig. 1b is gradually moved (arrow). d: The profile view. Wall rigidity under the profile view at the lesion in Fig. 1b is present (arrow). e: High-power view of Fig. 1d. The horizontal rigidity is 13.3 mm (black arrow), and the vertical rigidity is 4.4 mm (white arrow)