The Bismuth-Corlette classification is a classification system for perihilar cholangiocarcinomas, which is based on the extent of ductal infiltration 1,2.
Classification
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type I
limited to the common hepatic duct, below the level of the confluence of the right and left hepatic ducts
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type II
involves the confluence of the right and left hepatic ducts
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type IIIa
type II and extends to involve the origin of the right hepatic duct (confluence of the right posterior and anterior sectoral ducts)
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type IIIb
type II and extends to involve the origin of the left hepatic duct (confluence of the 2nd, 3rd and 4th segmental ducts)
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type IV
extending to and involving the origins of both right and left hepatic ducts (i.e., combination of types IIIa and IIIb)
ormultifocal involvement
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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 ref required.