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Duplication common bile duct classification proposed by Choi et al. Type I:septum separatting CBD; Type II: CBD bifurcates to drain separately; Type III: double biliary drainage without (a) or with (b) intrahepatic communicating channels; Type IV: double biliary drainage with extrahepatic communicating channels; Type V: single biliary drainage of double commen bile ducts without (Va) or with (Vb) communicating channels
