Gallstone ileus is a mechanical obstruction of the intestinal tract caused by gallstones. Usually, the responsible stone is solitary and large, 2 to 5 cm in diameter, and enters the bowel through a cholecystoduodenal fistula. Gallstone ileus is not a common occurrence. This condition can be difficult to diagnose, causing a delay in surgical treatment. Because of this delay, the mortality rate is high, 15% to 20%. When the diagnosis of gallstone ileus is made preoperatively, it is usually done radiographically. In this case, the diagnosis was made based on the ultrasound findings.
