Intrahepatic cholestasis caused by paucity of interlobular bile ducts associated with cardiovascular and other anomalies. Major abnormalities include characteristic facies (prominent forehead, deeply set eyes, hypertelorism, straight nose, and pointed chin) sometimes referred to as cholestasis facies, hoarse voice, and a wide variety of other disorders. Moderate mental retardation occurs in about 15 %. Cerebrovascular complications may include the moyamoya syndrome (progressive obliteration of the intracranial carotid arteries and formation of an extensive vascular network of dilated small branches. The disorder was first reported in Japanese children, and the angiographic appearance of thus formed fine network was described by the Japanese expression "moyamoya," meaning "something hazy, like a puff of smoke drifting in the air," as seen on the radiograph).