<prompt> FALSE about Gallstone ileus:90 patients give history of biliary diseaseCauses 1 of all SBO; around 25 cases in 70 yearsTumbling obstructionFistula is mostly formed between duodenum and gallbladder  <response>: Ans. a 90 patients give history of biliary disease PREVIOUS ho of gall stone related symptoms is seen only in 50 cases. Gall stone Ileus constitutes only 1 of etiology of all Small bowel obstructions also 1 of gallstone cases get this complication. In old age 70 years- 25 cases are due to Gall stone ileus 