Psoas Abscess Secondary to Migrated Biliary Stent: A Rare Complication of Endoscopic Biliary Drainage

Endoscopic biliary stenting is a common and generally safe intervention for biliary obstruction. Stent migration is an uncommon complication, and extraintestinal migration resulting in abscess formation is exceptionally rare. We describe the case of a 75-year-old woman with a past medical history of childhood polio, nummular eczema (on methotrexate) and hypertension, who developed a left iliopsoas abscess seven months after endoscopic biliary stent insertion for choledocholithiasis. Imaging revealed that the stent had migrated through the duodenal wall and inferolaterally to the left iliac bone. The abscess was drained percutaneously, and the stent was retrieved endoscopically. This case highlights the need for timely follow-up after biliary stent insertion and complete retrieval of redundant stents where possible, and the importance of considering stent migration in patients with unexplained retroperitoneal abscesses.