CT Abdomen and pelvis
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Scout shows a marked distention of the sigmoid colon that assumes a coffee bean–like configuration.
Sigmoid volvulus is an abnormal twisting of the sigmoid colon along its mesenteric axis that causes closed-loop obstruction and can lead to ischaemia, perforation, and death.
The coffee-bean sign is a sign on an abdominal plain film of a sigmoid volvulus although some authors have also used the term to refer to closed loop small bowel obstructions.