摘要:Introduction: Complex cholecysto-duodeno-colic fistulas are an extremely rare complication that can occur in patients with cholelithiasis. The aim of this article is to present the case of a pacient with cholecystoduodeno- colic fistula manifested with biliary ileus in a patient known for many years with cholelithiasis. Case report: We present the case of a 62 y/o male that was admitted in our clinic with the diagnosis of gallstone ileus. Emergency surgical intervention was needed. Intraoperatively we discovered a cholecysto-duodenocolic fistula complicated with gallstone ileus. During the operation we practiced retrograde cholecystectomy, closure of the fistulous tract (duodenoraphy, coloraphy), enterotomy and extraction of the calculus located inside the small intestine. The postoperative evolution was favorable. Conclusions: Cholecysto-duodeno-colic fistulas complicated with gallstone ileus are an extremely rare complication that can occur in patients with gallstones. In case of the occurrence of gallstone ileus, the surgical treatment is an emergency, being the only therapeutic technique that can save the patient’s life.