Komi classification of bile duct cysts

Last revised by Calum Worsley on 3 Nov 2021

Komi classification of bile duct cysts divides anomalous union of the pancreatico-bile ducts (AUPBD) into three types based on the angle of union of the ducts 1.


  • type I: union of the ducts at a right angle to each other
    • type Ia: without dilatation or 
    • type Ib: with dilatation of the common channel. 
  • type II: union of the ducts with an acute angle between them
    • type IIa: without dilatation or 
    • type IIb: with dilatation of the common channel
  • type III: comprises of complex patterns of accessory pancreatic ducts, with or without intricate duct networks
    • type IIIa: is similar to the classic pancreas divisum with biliary dilatation
    • type IIIb: characterized by the absence of the Wirsung’s duct
    • type IIIc
      • type IIIc1: tiny communication exists between the main duct and the accessory ducts
      • type IIIc2: comprises of a common channel made up of common and accessory ducts of equal caliber
      • type IIIc3: total or partial dilatation of the ductal system

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