Kasai classification

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Kasai classification is used to describe the three main anatomical types of biliary atresia.

Classification
  • type I: obliteration of common bile duct (patent cystic and common hepatic duct)
  • type II
    • IIa: obliteration of common hepatic duct (patent cystic and common bile duct), sometimes with a cyst at hilum hence termed cystic biliary atresia
    • IIb: obliteration of common hepatic duct, cystic and common bile duct
  • type III: obliteration of left and right main hepatic ducts at the level of porta hepatis (most common, 90%)

Note: some authors have mentioned this anatomical classification as Japanese and Anglo-Saxon classification .