Fig. 1. (A) Endoscopic retrograde cholangiopancreatography (ERCP) showing focal dilatation and narrowing of the intrahepatic and extrahepatic bile ducts. (B) ERCP showing focal dilatation and narrowing of the intrahepatic bile ducts. (C) Magnetic resonance cholangiopancreatography revealing irregular dilatation and narrowing and beaded appearance of the intrahepatic bile duct.