We herein report a 78-year-old man who underwent endoscopic retrograde cholangiopancreatography (ERCP) to examine main pancreatic duct (MPD) stenosis. During ERCP, MPD perforation occurred due to the cytology brush maneuver. Endoscopic pancreatic stenting to bridge the perforated site failed because the MPD was bent and formed a loop. Thus, we placed the stent at the proximal perforated side. The patient developed retroperitoneal perforation and pancreatic fistula with infection, showing a worsening condition. Pancreatic duct drainage was not effective, so we performed endoscopic ultrasonography-guided pancreatic duct drainage. Subsequently, he gradually improved and was discharged 3 months after initial ERCP.
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