Biliary stent migration: why, how, and what?

Biliary stent migration occurs at a rate of 8.4%. Stents do migrate because of dilated CBD, wide sphincterotomy, and biliary balloon dilation. Furthermore, wide, straight stents inserted for more than 1 month easily migrate. The migrated stents migrated intraluminal in the CBD, duodenum or the colon. All the retained migrated stents were retrieved endoscopically.