Cholelithiasis

Which of the following is the commonest site of impaction of gallstone ? A. Cystic duct B. Common hepatic duct C. Supraduodenal part of common bile duct D. Ampulla of Vater

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D. Ampulla of vater.
A
Answer is D As the distal end of ampulla of vater is the narrowest region of the extrabiliary passage, it becomes the commonest site of impaction of gall stone.
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