Malignant Vipoma

**Semantic type:** Neoplastic Process

**Definition:** 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.

**Synonyms:** - Vipoma, malignant