Anatomic observations and etiologic and surgical considerations in choledochal cyst.

Twenty-five operative and postoperative cholangiograms in children with choledochal cysts indicated an intimate relationship between these cysts and anomalous pancreatico-biliary ductal junction. In all of these patients the distal main pancreatic duct (MPD) is excluded from the sphinctor of Oddi mechanism and free reflux of pancreatic juice up the biliary tree occurs. This leads to chronic cholangitis, which is presumed to be responsible for the formation of the choledochal cysts. Abrupt and intense exposure of the common bile duct (CBD) to pancreatic reflux may cause perforation and bile peritonitis. Long-standing exposure may induce malignant transformation in the choledochal cyst. Total cyst excision and separation of the biliary system from exposure to pancreatic reflux is suggested as the procedure of choice. Long-term results and metabolic and digestive consequences of this operation are yet to be determined.