Case report: Migratory biliary stent resulting in sigmoid colon perforation.

Biliary stent insertion during endoscopic retrograde cholangiopancreatography is a therapeutic intervention to relieve obstruction and facilitate flow through the biliary tree. In rare circumstances, these stents can migrate and result in distal gastrointestinal perforation, which may necessitate endoscopic or surgical intervention. We report a case involving a 79-year-old female who presented with peritonitis due to sigmoid colon perforation following biliary stent migration. The stent was placed to treat acute cholangitis with choledocholithiasis. Two weeks following stent placement, gastroenterology attempted scheduled stent removal, but was unable to visualize the stent on endoscopy. Eleven days later, the patient was emergently taken to the operating room for an exploratory laparotomy and a Hartmann's procedure for stent migration and subsequent sigmoid perforation. No established protocol exists for managing migratory biliary stents to avoid perforations. We emphasize the need for follow-up imaging and individualized clinical decision-making based on patient stability.