Biliary intraductal papillary-mucinous neoplasm manifesting only as dilatation of the hepatic lobar or segmental bile ducts: Imaging features in six patients

OBJECTIVE. The purpose of this study was to evaluate the imaging features of intrahepatic biliary intraductal papillary-mucinous neoplasm manifesting only as dilatation of the lobar or segmental bile ducts without a visible mass to determine whether this type of cholangiocarcinoma can be recognized on the basis of distinct imaging features. CONCLUSION. Intrahepatic biliary intraductal papillary-mucinous neoplasm can spread along the mucosa without forming a mass and can produce a large amount of mucin. Severe dilatation of the lobar or segmental intrahepatic bile ducts with crowding and severe atrophy of the hepatic parenchyma are helpful imaging findings.