Prey sgn is usually seen in?

Volvulus is twisting of a segment of the intestine on an axis formed by its mesentery. This results in paial or complete obstruction of the lumen of bowel. Volvulus of the colon is the 2nd most common cause of complete colonic obstruction after carcinoma colon and most commonly involves the sigmoid colon. On a plain film of the abdomen features of sigmoid volvulus are: A large inveed U shaped loop of massively distended sigmoid colon is seen emerging from the pelvis. This is K/a bent inner tube or coffee bean appearance. Haustra are absent Apex of the loop lies under the left diaphragm Gastrograffin enema shows a narrowing at the site of the volvulus known as bird of prey sign or bird's beak appearance. Ref: Schwaz 9/e, Page 1055; Sutton 7/e, Page 677.