VIPoma

In a nutshell

A VIPoma or vipoma () is a rare endocrine tumor that overproduces vasoactive intestinal peptide (thus VIP + -oma). The incidence is about 1 per 10,000,000 per year. VIPomas usually (about 90%) originate from the non-β islet cells of the pancreas. They are sometimes associated with multiple endocrine neoplasia type 1. Roughly 50–75% of VIPomas are malignant, but even when they are benign, they are problematic because they tend to cause a specific syndrome: the massive amounts of VIP cause a syndrome of profound and chronic watery diarrhea and resultant dehydration, hypokalemia, achlorhydria, acidosis, flushing and hypotension (from vasodilation), hypercalcemia, and hyperglycemia. This syndrome is called Verner–Morrison syndrome (VMS), WDHA syndrome (from watery diarrhea–hypokalemia–achlorhydria), or pancreatic cholera syndrome (PCS). The eponym reflects the physicians who first described the syndrome.

Related on Lably

Through Pancreas, Cancer and Syndrome

Lab · Class 10–11Endocrine System & Hormones Lab · Class 10Control and Coordination Lab · Class 10–11Neural Control Lab · Class 7–10Reaching Adolescence

Symptoms and signs

The major clinical features are prolonged watery diarrhea (fasting stool volume > 750 to 1000 mL/day) and symptoms of hypokalemia and dehydration. Half of the patients have relatively constant diarrhea while the rest have alternating periods of severe and moderate diarrhea. One third have diarrhea < 1yr before diagnosis, but in 25%, diarrhea is present for 5 yr or more before diagnosis. Lethargy, muscle weakness, nausea, vomiting and crampy abdominal pain are frequent symptoms. Hypokalemia and impaired glucose tolerance occur in < 50% of patients. Achlorhydria is also a feature. During attacks of diarrhea, flushing similar to the carcinoid syndrome occur rarely.

3 more chapters are free with a Lably account.

More in Health

Food and Drug AdministrationFederal agency of the United States Department of Health and Human Services Centers for Disease Control and PreventionUnited States government public health agency NauseaMedical symptom or condition SeizurePeriod of symptoms due to excessive or synchronous neuronal brain activity VomitingExpulsion of stomach contents via the mouth or nose Intravenous therapyMedication administered into a vein

Symptoms and signs

Diagnosis

Treatment

Prognosis

More in Health