Hallmark features of gallstone ileus

What are the hallmark features of gallstone ileus? 

Although representing an infrequent cause of small bowel obstruction, gallstone ileus has significant associated mortality if the diagnosis is delayed. The characteristic imaging findings are referred to as Rigler’s triad: pneumobilia; small bowel obstruction; and an ectopic, intraabdominal, radiodense gallstone (most often lodged at the ileocecal valve).

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