ABSTRACT
Type I choledochal cysts predominate. Together with type IVa cysts, they account for more than 90 percent of cases. Intrahepatic duct dilatation that resolves after successful treatment of a type I cyst should be distinguished from the irregularly dilated intrahepatic ducts found with type IVa cysts. Caroli’s disease is characterized by segmental saccular dilatation of the intrahepatic bile ducts; it may affect the liver diffusely or be localized to one lobe.
