Endoscopic salvage therapy after failed biliary cannulation using advanced techniques: A concise review

Figure 4 Endoscopic ultrasound-assisted rendezvous procedures. A: Under endoscopic ultrasound, the proximal extrahepatic bile duct is punctured through the duodenal bulb. The sonoendoscope is in a long position; B: The guidewire is delivered antegradely to the duodenum through the puncture route; C: Switch to a duodenoscope to grasp the antegradely introduced guidewire.