A special growth manner of intrahepatic biliary cystadenoma

Figure 1 Magnetic resonance cholangiopancreatography (MRCP) showing the dilation of extrahepatic and intrahepatic bile ducts lacking of asymmetry.

Figure 2 Magnetic resonance imaging (MRI) showing different bile signals between the right and left intrahepatic ducts in a multiloculated lesion with internal septation.

Figure 3 A tumor embolus originating from left intrahepatic duct with smooth surface protrudes the extrahepatic bile duct.

Figure 4 Macroscopy revealing a multilocular cystic lesion containing serous fluid with tumor embolus protruding into the left hepatic duct and the extrahepatic bile duct.

Figure 5 Postoperative pathology showing epithelial lining composed of biliary-type cuboidal cells surrounded by an ovarian-like stroma (400 ×).