Self-expandable covered metallic stent as a conduit for pancreatic stone extraction
A 50-year-old man was referred for evaluation of alcohol-related chronic relapsing pancreatitis. Initial endoscopic retrograde cholangiopancreatography (ERCP) revealed a dilated pancreatic duct with a stone proximal to a distal stricture. The stricture was dilated to 6 mm using a balloon, and an 8.5-Fr plastic stent was placed to ensure drainage. ERCP 2 months later showed no improvement in the stricture and a 10-Fr stent was placed.
Repeat pancreatography 2 months later ( [Video 1] ) revealed a persistent distal stricture with a floating ovoid-shaped stone (6 × 10 mm) in the proximally dilated duct ( [Fig. 1 a] ). The stricture was dilated to 6 mm ( [Fig. 1 b] ), and an 8 mm × 4 cm fully covered Gore Viabil (Conmed Corp., Utica, New York, USA) self-expandable metallic stent (SEMS) was placed across the stricture. A rat-tooth forceps was passed through the SEMS and the stone was grasped ( [Fig. 2] ) under fluoroscopic guidance. The stone and stent were then simultaneously extracted from the duct and removed from the patient ( [Fig. 3] , [Video 1] ). There were no post-procedural complications.
Video 1 Removal of a pancreatic duct stone with the aid of a self-expandable metallic stent.
Fig. 1 Pancreatography. a Distal stricture with associated stone. b Dilation of the pancreatic duct stricture.
Fig. 2 Use of the rat-tooth forceps. a Endoscopic image showing advancement of rat-tooth forceps through the self-expandable metallic stent. b Fluoroscopic image showing rat-tooth forceps grasping the pancreatic duct stone.
Fig. 3 Fluoroscopic image showing simultaneous removal of the pancreatic duct stone and metallic stent.
Ductal hypertension, as a result of obstruction from pancreatic duct stones and strictures in chronic pancreatitis, is believed to be the major cause of pain and recurrent pancreatitis  . Treatment options for pancreatolithiasis vary depending on stone location and size   . The 2015 European Society of Gastrointestinal Endoscopy recommends the use of ERCP as first-line therapy in patients with a small number of stones with a diameter of < 5 mm in the body and proximal pancreas. For larger stones, extracorporeal shock wave lithotripsy prior to ERCP is recommended  . We present a unique method of pancreatic stone removal using a fully covered SEMS as a conduit for passage of a rat-tooth forceps across a distal stricture to facilitate pancreatic stone extraction.
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Heather Branstetter, MD
Methodist Dallas Medical Center
1441 N Beckley Avee
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