gastrointestinal system disease
   |__hepatobiliary disease
       |__biliary tract disease  7 rec.
           |__bile duct disease 7 rec.
           |   |__ampulla of Vater benign neoplasm(+)
           |   |__bile duct adenoma(+)
           |   |__bile duct cancer(+)
           |   |__bile duct carcinoma in situ
           |   |__bile duct cystadenoma(+)
           |   |__Caroli disease
           |   |__Caroli syndrome
           |   |__cholangitis(+) 4 rec.
           |   |__choledochal cyst
           |   |__cholestasis(+) 7 rec.
           |   |__common bile duct disease(+)
           |   |__extrahepatic bile duct leiomyoma
           |   |__extrahepatic bile duct lipoma
           |   |__fascioliasis
           |__bile reflux
           |__biliary tract benign neoplasm
           |   |__ampulla of Vater benign neoplasm(+)
           |   |__bile duct adenoma(+)
           |   |__bile duct cystadenoma(+)
           |   |__biliary papillomatosis(+)
           |   |__biliary tract intraductal papillary mucinous neoplasm
           |   |__common bile duct neoplasm
           |   |__extrahepatic bile duct leiomyoma
           |   |__extrahepatic bile duct lipoma
           |   |__gallbladder benign neoplasm(+)
           |__perforation of bile duct
           |__postcholecystectomy syndrome