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
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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
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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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