label: Malignant Vipoma
label_lc: malignant vipoma
description: An aggressive neuroendocrine tumor located in the pancreas or small intestine. It is composed of cells containing vasoactive intestinal peptide.  It is associated with watery diarrhea, hypokalemia, and hypochlorhydria or achlorhydria. It displays vascular invasion and metastasizes to other anatomic sites.