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Bismuth–Corlette classification [22].
| Type | Distinction |
|---|---|
| I | Limited to the common hepatic duct |
| II | Involving the confluence of the left and right hepatic ducts |
| IIIa | Involving the main hepatic confluence and extending to the bifurcation of the right hepatic duct |
| IIIb | Involving the main hepatic confluence and extending to the bifurcation of the left hepatic duct |
| IV | Involving the main, right, and left hepatic confluence |
