Abstract
Intraductal papillary neoplasm of the bile duct (IPNB) is a rare biliary tract neoplasm. Although IPNB as an entity has been recently recognized globally, the preoperative diagnosis of IPNB is sometimes difficult. In most IPNB cases, dilatation of the intrahepatic bile duct communicating with the mucin-producing tumor is a typical finding. We report a case of mucin-producing intrahepatic cholangiocarcinoma originating from an IPNB, which showed no dilatation of the intrahepatic bile ducts.
A 56-year-old man had routine abdominal ultrasonography screening ; a solitary tumor in segment 4 of the liver was detected. However, contrast-enhanced CT and MRI results did not allow a definitive diagnosis of a tumor to be mode. However, during the previous 17 months, the patient had been followed by CT, and the tumor had been gradually enlarging. Thus, FDG-PET was done and showed FDG uptake in the liver tumor. Therefore, under a diagnosis of malignant liver tumor, the patient underwent an extended left hepatic lobectomy. The liver tumor was diagnosed on histology as a mucin-producing cholangiocarcinoma originating from the IPNB.
