Transition of a pancreatic neuroendocrine tumor from ghrelinoma to insulinoma: a case report.

Pancreatic neuroendocrine tumors (PNETs) are rare with an incidence of 1 in 100,000 populations. PNETs can present either as a functional or non-functional tumor. In functional tumors the symptoms are a result of hormones such as insulin, gastrin, glucagon and vasoactive intestinal peptide (VIP) or others.