<prompt> Bird of prey sign is seen inGastric volvulusIntussusceptionSigmoid volvulusCaecal volvulus  <response>: Sigmoid volvulus is a cause of large bowel obstruction and occurs when the sigmoid colon twists on the sigmoid mesocolon. Imaging signs areRadiograph:coffee bean signFrimann Dahl;s sign - three dense lines converge towards the site of obstructionabsent rectal gas water-soluble contrast enema - the beak sign or bird beak sign. CTlarge gas-filled loop without haustral markings, forming a closed-loop obstructionwhirl sign: twisting of the mesentery and mesenteric vesselsbeak sign: if rectal contrast has been administered Ref: Grainger and Allison;s diagnostic radiology 6th edition, chapter 25 