Extrahepatic Bile Duct Neuroendocrine Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A neoplasm with neuroendocrine differentiation that arises from the extrahepatic bile ducts. It includes neuroendocrine tumors (well-differentiated neuroendocrine neoplasms) and neuroendocrine carcinomas (poorly differentiated neuroendocrine neoplasms).