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Sigmoid volvulus

A sigmoid volvulus occurs when the sigmoid colon torses on its mesentery, the sigmoid mesocolon.

Imaging specific signs include the inverted 3 sign which may also be referred to as the coffee bean sign. Another sign is the Frimann Dahl's sign where three dense lines converge towards site of obstruction.  Although now uncommonly performed, a water soluble enema exquisitly demonstrates this condition, with the apperances described as the bird of prey sign.

It is differentiated from a caecal volvulus by its ahaustral wall and the lower end pointing to pelvis.

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