Fig. 2 Classification of stent misdeployment in endoscopic ultrasound-guided choledochoduodenostomy using a lumen-apposing metal stent. Type I: distal flange deployed between the bile duct and duodenal lumen with bile duct injury. Type II: proximal flange deployed outside of the duodenal lumen. Type III: cautery injury to the contralateral bile duct wall. Type IV: double mucosal puncture at the level of the duodenal or gastroduodenal walls.