<prompt> Riglers triad consists of all exceptIntestinal obstructionGas in bile ductCholangitisEctopic gallstone  <response>: Gall stone ileus Passage of stone through a spontaneous biliary-enteric fistula leading to a mechanical bowel obstruction Clinical features Riglers triad : Classic plain abdominal film triad of small bowel obstruction, pneumobilia ectopic gallstone Ref: Sabiston 20th edition Pgno :1506-1507 