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Types of biliary cysts according to Todani classification. I: Solitary extrahepatic cyst (40%-85%): IA: Common type; IB: Segmental extrahepatic duct dilatation; IC: Diffuse extrahepatic dilatation; II: Extrahepatic diverticulum (2%-3%); III: Choledochocele (1.4%-5.6%); IVA: Multiple extra- and intrahepatic cysts; IVB: Multiple extrahepatic cysts (18%-20%); V: Multiple intrahepatic cysts (Caroli’s disease) (rare).
