VIPoma is an extremely rare type of pancreatic neuroendocrine tumor (see this term) that secretes vasoactive intestinal polypeptide (VIP) leading to the manifestations of watery diarrhea, hypokalemia and achlorhydia or hypochhlorhydia (known as WDHA syndrome).

Yellow pigmentation of the skin due to bilirubin, which in turn is the result of increased bilirubin concentration in the bloodstream.