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Table 1 Anatomical types of biliary atresia (BA)

From: Biliary atresia

French classification Frequency Description Upper level of obstruction of the extrahepatic bile ducts US/UK/Japanese classification
Type 1 ~3% Atresia limited to the common bile duct Common bile duct Type 1
Type 2 ~6% Cyst in the liver hilum communicating with dystrophic intrahepatic bile ducts Hepatic duct Type 2
Type 3 19% Gallbladder, cystic duct and common bile duct patent Porta hepatis Type 3
Type 4 72% Complete extrahepatic BA Porta hepatis Type 3