• type I

  • limited to the common hepatic duct, below the level of the confluence of the right and left hepatic ducts

 

• type II

  • involves the confluence of the right and left hepatic ducts

 

• type IIIa

  • type II and extends to the bifurcation of the right hepatic duct

 

• type IIIb

  • type II and extends to the bifurcation of the left hepatic duct

 

• type IV

  • extending to the bifurcations of both right and left hepatic ductsor

  • multifocal involvement

 

• type V

  • stricture at the junction of common bile duct and cystic duct

 

 

The classification system may be used both for cholangiocarcinoma and benign strictures.