label: Ampulla of Vater Small Cell Neuroendocrine Carcinoma
label_lc: ampulla of vater small cell neuroendocrine carcinoma
description: "An aggressive, high-grade and poorly differentiated carcinoma with neuroendocrine differentiation that arises from the ampulla of Vater and the periampullary region.  It is characterized by the presence of malignant small cells."