An Intraductal Papillary Neoplasm of the Bile Duct at the Duodenal Papilla

Abstract

In recent years, the disease concept of intraductal papillary neoplasm of the bile duct (IPNB) has been attracting attention as a biliary lesion that is morphologically similar to intraductal papillary mucinous neoplasm (IPMN), which is considered to be a counterpart of IPMN. However, there are few reports on IPNB, and a consensus regarding the features of this disease is thus lacking. We experienced an extremely rare case of IPNB occurring in the bile duct at the duodenal papilla, which is a tumor presentation that has not previously been reported. Herein, we report this interesting case and discuss the possible association between IPMN and IPNB.

Keywords

• Intraductal ultrasound
• Peroral cholangioscopy
• Intraductal papillary neoplasm of the bile duct
• Duodenal papilla
• Intraductal papillary mucinous neoplasm