<unk>  (communicating cavernous ectasia, or congenital cystic dilatation of the intrahepatic biliary tree) is a rare inherited disorder characterized by cystic dilatation (or ectasia) of the bile ducts within the liver. There are two patterns of<unk> : focal or simple<unk>  consists of abnormally widened bile ducts affecting an isolated portion of liver. The second form is more diffuse, and when associated with portal hypertension and congenital hepatic fibrosis, is often referred to as<unk>  syndrome". The underlying differences between the two types are not well understood.<unk>  is also associated with liver failure and polycystic kidney<unk> . The<unk>  affects about one in 1,000,000 people, with more reported cases of<unk>  syndrome than of<unk> .<unk>  is distinct from other<unk> s that cause ductal dilatation caused by obstruction, in that it is not one of the many choledochal cyst derivatives.
Caroli disease
Haff disease
Darier's disease
Lev's disease
Machado–Joseph disease
Kyrle disease
Tornwaldt's disease
Chandler's disease