Intraductal cholangioscopy for the diagnosis of pancreaticobiliary maljunction
09. August 2019 (online)
An 8-year-old girl was admitted to our department because of acute pancreatitis. She had undergone laparoscopic cholecystectomy 2 weeks previously. A 13-mm dilatation of the common bile duct (CBD) and a biliary tract obstruction next to the papilla were observed on magnetic resonance imaging (MRI) during hospitalization ([Fig. 1]). After endoscopic sphincterotomy was carried out during endoscopic retrograde cholangiopancreatography (ERCP), proteinaceous material was removed from the distal end of the bile duct ([Fig. 2]), with resolution of the biliary obstruction. When radiographic contrast dye was injected into the distal bile duct, the pancreatic duct, a dilated CBD similar to a choledochal cyst, and a long common channel were observed ([Fig. 3]). Therefore, a pancreaticobiliary maljunction (PBM) was suspected. Subsequently, an intraductal cholangioscopy using the SpyGlass DS Direct Visualization System (Boston Scientific Co., Natick, Massachusetts, USA) was performed to confirm a PBM type I, in which the pancreatic duct enters the CBD ([Fig. 4]; [Video 1]).
Video 1 Intraductal cholangioscopy (SpyGlass DS system) showing direct visualization of a pancreaticobiliary maljunction. Guidewire advancement under fluoroscopic guidance allowed each duct to be identified.
PBM is a congenital anomaly in which the pancreatic and bile ducts are joined outside the duodenal wall, usually forming a long common channel . There are two modes of junction: type I (pancreaticobiliary type) and type II (biliary–pancreatic type) . The incidence is 4.1 %  and it may or may not be associated with biliary dilatation (i. e. congenital choledochal cyst). Because of the PBM, the junction is not directly affected by the sphincter of Oddi; therefore, continuous reflux between the pancreatic and biliary juices occurs, which results in protein plugs. Different pathological conditions have been associated, such as acute pancreatitis, gallstones, and biliary cancer (gallbladder and bile duct) . PBM can be diagnosed either by imaging tests (ERCP, percutaneous transhepatic cholangiography, MRI) or surgical examination .
We showed that intraductal cholangioscopy using the SpyGlass DS System can be a novel diagnostic tool that allows direct visualization of a PBM.
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