Original: A VIPoma (also known as Verner Morrison syndrome, after the physicians who first described it ) is a rare (1 per 10,000,000 per year) endocrine tumor, usually (about 90%) originating in the pancreas, that produces vasoactive intestinal peptide (VIP).
Simplified: A VIPoma  (Pronounced "V I P oma") (also called Verner Morrison syndrome after the doctors who first noticed it), is a tumor that does not happen a lot (1 per 10,000,000 per year) in the pancreasDorland's Medical Dictionary.