Fig. 1.

Endoscopy view of various steps of performing single-stage procedure with combined tri-endoscopic approach for patients with concomitant gallbladder stones and CBD stones. A Choledochoscope is inserted directly into the dilated cystic duct under laparoscopic view. B Choledochoscopic view of common bile duct stone. C The guidewire is inserted into the CBD via choledochoscope and arrived at the lumen of the descending duodenum. D The hydrophilic end of the guidewire is caught and pulled out of the duodenoscope. E An ENBD tube is inserted along the guidewire. F The position of the ENBD tube is confirmed by choledochoscope