Modified Choi classification of common bile duct duplication

Last revised by Joachim Feger on 30 Nov 2023

Modified Choi classification of common bile duct duplication is a widely used system for classifying the rare duplication of the extrahepatic biliary tree. 1-3:

  • type I: distal septum splitting the bile duct lumen

  • type II: bifurcation of the distal bile duct with each lumen draining independently

  • type III: complete duplication of the bile ducts

    • IIIa: without communicating channels

    • IIIb: with intrahepatic communicating channels

  • type IV: two bile ducts with extrahepatic communicating channel(s) each with a separate opening

  • type V: duplicated proximal bile ducts with single biliary drainage

    • Va: without communicating channels

    • Vb: with communicating channels

A further modification of the Choi classification has been suggested by Sheng et al 3: a subdivision of type I, according to whether a luminal septum, partially (a) or completely (b) subdivides the duct into two ducts. They also made a tweak to type V, best appreciated by reading the reference 3.

History and etymology

In 1988, Saito and colleagues proposed a classification system for bile duct duplication in a Japanese paper 1. This was modified by E Choi et al in a, English language article in 2007 which became known as the modified Choi classification 2.

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