Which radiographic findings suggest sigmoid volvulus?

Updated: Nov 28, 2018
  • Author: Scott C Thornton, MD; Chief Editor: John Geibel, MD, DSc, MSc, AGAF  more...
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Answer

Massive dilation of the sigmoid colon loop arising from the pelvis and extending to the diaphragm is a typical finding of sigmoid volvulus. The walls of the loop are evident as three bright lines converging in the pelvis to create a beaklike appearance (see the image below).

Cecal bascule. (A) Anterior folding of cecum. (B) Cecal bascule. (A) Anterior folding of cecum. (B) Lack of dorsal mesenteric fixation of cecum to retroperitoneum.

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