Sigmoid volvulus

Case contributed by Dr Domenico Nicoletti


Acute abdomen with intense abdominal pain and complete constipation

Patient Data

Age: 75 years
Gender: Male

Markedly dilated loop of colon with a coffee-bean shape (omega sign). Sigmoid colon arising from the pelvis, with its apex in the right upper abdomen. The interposed loops produce the white-stripe sign


Sigmoid dilatation with air-fluid levels and the whirl sign, which represents twisted colon and mesentery. Window settings show the whirl sign and the classic beak sign at the level of the twist.

Case Discussion

Sigmoid volvulus is particularly common in elderly persons.

Sigmoid volvulus is abnormal twisting of the sigmoid colon along its mesenteric axis that causes closed-loop obstruction and can lead to ischemia.

Radiographer: Barbara Fabbri

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Case information

rID: 63692
Published: 14th Oct 2018
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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