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| Type 1 Low common hepatic duct (CHD) stricture, with a length of the CHD stump of >2 cm |
| Type 2 Middle stricture: length of CHD <2 cm |
| Type 3 Hilar stricture, no remaining CHD, but the confluence is preserved |
| Type 4 Hilar stricture, with involvement of confluence and loss of communication between right and left hepatic duct |
| Type 5 Combined common hepatic and aberrant right hepatic duct (RHD) injury, separating from the distal common bile duct (CBD) |
