Well-Differentiated Neuroendocrine Carcinoma of the Extrahepatic Biliary Duct

Extrahepatic bile duct tumors are uncommon, with the majority being adenocarcinomas. Primary neuroendocrine tumors of the extrahepatic bile ducts are extremely rare. Herein, we report a case of the extrahepatic biliary duct primary well-differentiated neuroendocrine carcinoma in a 45-year-old woman.