Pancreatic stent improves the success rate of needle-knife papillotomy in patients with difficult biliary cannulation

Figure 3 Freehand needle-knife papillotomy in a patient with difficult biliary cannulation. A: Difficult biliary cannulation in a patient with periampullary diverticulum; B: The direction of the bile duct is unclear during cannulation; C: Failure of selective biliary intubation after freehand needle-knife papillotomy.