What causes hyperpituitarism?

Updated: Oct 24, 2016
  • Author: Alicia Diaz-Thomas, MD, MPH; Chief Editor: Robert P Hoffman, MD  more...
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Hypothalamic dysfunction can promote tumor growth, but overwhelming evidence points to intrinsic pituicyte genetic disruption as the main underlying cause of pituitary tumorigenesis. The monoclonal nature of most pituitary adenomas, confirmed with X-inactivation studies, implies their origin from a clonal event in a single cell. Most pituitary adenomas are functional, and clinical presentation typically depends on the particular pituitary hormone that is hypersecreted. Nonfunctioning pituitary adenomas are rare in children, accounting for only 3-6% of all adenomas in 2 large series; they comprise 30% of adenomas in adults.

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