External pancreatic fistula treated by endoscopic ultrasound-guided drainage with a novel lumen-apposing metal stent mounted on a cautery-tipped delivery system.

One of the most common causes of external pancreatic fistula is the iatrogenic manipulation of a complex pancreatic fluid collection concomitantly associated with a disconnected pancreatic duct [1,2]. This situation can lead to the development of a high output (up to 400mL/d) external pancreatic fistula that is difficult to manage and sometimes requires surgery [3]. In 2012, a 40-year-old woman underwent laparoscopic cholecystectomy with a hepaticojejunal Roux-en-Y anastomosis for a congenital Todani’s type IV common bile duct cyst. Postoperative pancreatitis resulted in the development of a complex pancreatic fluid collection in the pancreatic head, which was drained percutaneously. Subsequently, an external pancreatic fistula formedwith an output of 200mL/d. In 2014, the patient was referred to us for further evaluation. Endoscopic retrograde cholangiopancreatography (ERCP) showed a normal main pancreatic duct that lacked a clear communication with the collection (●" Fig.1). The injection of contrast through the percutaneous catheter showed the presence of a 4-cm fluid collection (●" Fig.2). Endoscopic ultrasound (EUS)-guided drainage with the placement of plastic stentswas planned. At EUS, the collection was accessed from the duodenal bulbwith a 19-gauge needle, after which a 0.035-inch guidewire was placed. The needle was then exchanged for an 8.5-Fr cystotome, but the collection no longer appeared adjacent to the duodenal wall, probably because it had been pushed away by the guidewire, and major vesselswere interposed (●" Video1). Based on our previous experience, we decided to replace the cystotome with a novel cautery-tipped stent delivery system that allows the single-step EUS-guided placement of a lumen-apposing fully covered metal stent (Hot AXIOS System; Xlumena, Mountain View, California, USA) [4]. The lesionwas directly punctured and entered with the system, and an 8×8-mm lumenapposing fully covered metal stent was delivered under complete EUS guidance (●" Fig.3,●" Video 1). The output significantly dropped the following day, allowing removal of the external catheter 2 days after the procedure. The patient was discharged and remains well 3 months later, without any symptoms.