Malignancy of intraductal papillary neoplasm of the bile duct.

Intraductal papillary neoplasm of the bile duct (IPNB) is an uncommon disease which was first included in the World Health Organization classification of neoplasms in 2010. A 64-year-old female was admitted to the hospital because of a hepatic lesion incidentally diagnosed during acute cholangitis. Abdominal computed tomography (CT) and magnetic resonance imaging (MRI) showed a well delimited 70 mm mass, with a predominant cystic component and hyperenhancement of papillary internal branching, consistent with a hydatid cyst. However, malignancy could not be excluded. The patient rapidly developed an acute abdomen syndrome, thus precluding a liver biopsy. A new urgent CT was performed to rule out a complication of the cystic lesion. A left hepatectomy was performed and the anatomopathological study confirmed the diagnosis of IPNB with a focus of cholangiocarcinoma therein. During follow up, the patient developed peritoneal carcinomatosis, received palliative chemotherapy and finally died.