False about gallstone ileus: (A) 90% patients give history of biliary disease, (B) Causes 1% of all SBO ; around 25% cases in >70 years, (C) Tumbling obstruction, (D) Fistula is mostly formed between duodenum and gallbladder
Answer is A. Option B: Rigler's triad - Classic plain abdominal film of triad of small bowel obstruction, pneumobilia & ectopic gallstone Option C: pain may be episodic and recurrent as the impacted stone temporarily obstructs the bowel lumen and then dislodges and moves distally, known as tumbling obstruction Option D: most common site of biliary enteric fistula is gallbladder and duodenum So opting for option A. Ref: Sabiston 20th edition Pgno : 1506-1507