<prompt> A 38 year old male has paroxysmal hypeension. He is subsequently found to have medullary carcinoma of the thyroid, pheochromocytoma, and mucosal neuromas. Parathyroid involvement is not noted. What is the most likely diagnosis?MEN type IMEN type IIMEN type IIISipples syndrome  <response>: MEN III, also known as MEN IIb, is characterized by medullary thyroid carcinoma, pheochromocytoma, and mucosal neuromas.Wermers syndrome is also called MEN type I . It is characterized by pancreatic insulinoma, pituitary, and parathyroid involvement.Sipples syndrome, or MEN type II , is similar to MEN III, but it has parathyroid involvement tumor or adenoma as opposed to neuromas. Ref: Wyatt C., Butterwoh IV J.F., Moos P.J., Mackey D.C., Brown T.G. 2008. Chapter 18. Endocrine Pathology. In C. Wyatt, J.F. Butterwoh IV, P.J. Moos, D.C. Mackey, T.G. Brown Eds, Pathology: The Big Picture. 