Papillary cystadenocarcinomain a patient with right abdominal pain. A T2-weighted image (a) showed marked dilatation of the intrahepatic and extrahepatic bile ducts with multiple heterogeneously hypointense polypoid nodules on the surface. The hepatocellular phase (b) showed that the polypoid nodules were homogeneously hypointense, and nearly no Gd-EOB-DTPA was seen in the dilated bile duct. The biliary phase (c) showed that most of the dilated bile duct was filled with Gd-EOB-DTPA, indicating that the function of biliary system was normal. Gd-EOB-DTPA-enhanced MR cholangiography (d) showed that the intrahepatic and extrahepatic bile ducts were well-filled with contrast agent.