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What is Bent inner tube sign is seen in and explain in detail?
Ans. (a) VolvulusRef: Manipal Manual of surgery, 4th ed./739* In sigmoid volvulus, the X ray abdomen erect shows hugely dilated sigmoid loop called bent inner tube sign.* Acute sigmoid volvulus presents as intestinal obstruction and starts after straining at stool. It occurs in anti-clockwise direction and after one and a half turns, the entire loop becomes gangrenous.* The percussion note on the abdomen shall be tympanitic note.