label: Extrahepatic Bile Duct Neuroendocrine Carcinoma
label_lc: extrahepatic bile duct neuroendocrine carcinoma
description: "An aggressive, high-grade, and poorly differentiated carcinoma with neuroendocrine differentiation that arises from the extrahepatic bile ducts. The mitotic count is more than 20 per 10 HPF. It is classified as either small or large cell neuroendocrine carcinoma based on the size of the malignant cells, the prominence of the nucleoli, and the amount of cytoplasm."