label: ampulla of vater small cell neuroendocrine carcinoma
label_lc: ampulla of vater small cell neuroendocrine carcinoma
description: "An aggressive neuroendocrine carcinoma arising from the ampulla of Vater and the periampullary region. Morphologically, it is characterized by the presence of small malignant cells, necrosis, and a high mitotic rate. Signs and symptoms include jaundice, abdominal pain, anorexia, nausea, vomiting, and weight loss."