Hyperpituitarism

Hyperpituitarism is a condition due to the primary hypersecretion of pituitary hormones;[3] it typically results from a pituitary adenoma. In children with hyperpituitarism, disruption of growth regulation is rare, either because of hormone hypersecretion or because of manifestations caused by local compression of the adenoma.[2]

Not to be confused with Hypopituitarism.
Hyperpituitarism
Pituitary gland
SpecialtyEndocrinology 
SymptomsHirsutism[1]
CausesFrom a pituitary microadenoma.[2]
Diagnostic methodMRI[2]
TreatmentDopamine agonists [2]

Symptoms and signs

Symptoms caused by hormone excess and associated mass effects include:

Cause

The cause of hyperpituitarism in most cases is due to pituitary adenomas. They usually come from the anterior lobe, are functional and secrete the hormone, GH and prolactin.[6]

Mechanism
Growth hormone

Evidence indicates that the mechanism of hyperpituitarism can originate from genetic disruption causing pituitary tumorigenesis, most pituitary adenomas are monoclonal, which in turn indicates their origin from an event in a single cell.[2] There are three hormones that are oversecreted resulting in the pituitary adenoma: prolactin, adrenocorticotropic hormone (ACTH), and growth hormone (GH).

Excess prolactin may result in a prolactinoma[7] Excess GH results in gigantism, the severity of gigantism depends on whether the epiphyseal plate is open.[8] The four most common types of hyperpituitarism are caused by 4 types of pituitary adenoma, as follows: prolactinoma, corticotropinoma (Cushing's disease), somatotropinoma (gigantism), and thyrotropinoma .[9]

Diagnosis

For the diagnosis of hyperpituitarism it depends on the cell type(s) affected, clinical manifestations of hormone excess may include, gigantism or acromegaly, which can be identified by clinical and radiographic results.[10] Cushing's disease diagnosis is done with a physical examination, laboratory tests and X rays of the pituitary glands (to locate tumors)[11] For prolactinoma, diagnosis comes in the form of the measurement of serum prolactin levels and x-ray of pituitary gland.[12]

Treatment
Dopamine

Treatment (for hyperpituitarism) in the case of prolactinoma consists of long-term medical management. Dopamine agonists are strong suppressors of PRL secretion and establish normal gonadal function. It also inhibits tumor cell replication (in some cases causes tumor shrinkage)[13] Treatment for gigantism begins with establishing target goals for IGF-1, transsphenoidal surgery (somatostatin receptor ligands- preoperatively) and postoperative imaging assessment.[14] For Cushing's disease there is surgery to extract the tumor; after surgery, the gland may slowly start to work again, though not always.[15]

See also

References
  1. Hales, edited by Stuart C. Yudofsky, Robert E. (2007). The American Psychiatric Publishing textbook of neuropsychiatry and behavioral neurosciences (5th ed.). Washington, DC: American Psychiatric Pub. p. 815. ISBN 978-1-58562-239-9. Retrieved 26 August 2015. {{cite book}}: |first1= has generic name (help)
  2. Hyperpituitarism at eMedicine
  3. "Hyperpituitarism". Freedictionary.com. Farlex. 2015. Retrieved 28 August 2015.
  4. Baumle, [edited by] Lois White, Gena Duncan, Wendy (2013). Medical-surgical nursing : an integrated approach (3rd ed.). Clifton Park, NY: Delmar Cengage Learning. p. 595. ISBN 978-1-4354-8802-1. Retrieved 26 August 2015. {{cite book}}: |first1= has generic name (help)
  5. "Prolactinoma". MedlinePlus. NIH. Retrieved 26 August 2015.
  6. Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon C. (2014-08-27). Robbins and Cotran Pathologic Basis of Disease, Professional Edition: Expert Consult - Online. Elsevier Health Sciences. ISBN 9780323296397.
  7. "Prolactinoma". NIH. NIH. 2014. Retrieved 26 August 2015.
  8. Gigantism and Acromegaly at eMedicine
  9. Aguirre, Alfredo (2014). Cellular Endocrinology in Health and Disease. Elsevier. p. 24. ISBN 978-0-12-408134-5.
  10. "Acromegaly". NIH. National Institute of Diabetes and Digestive, Kidney Disease. 2014. Retrieved 28 August 2015.
  11. "Cushing's Syndrome". www.niddk.nih.gov. Retrieved 2015-08-25.
  12. Laws, Edward; Ezzat, Shereen; Asa, Sylvia; Rio, Linda (2013-02-21). Pituitary Disorders: Diagnosis and Management. John Wiley & Sons. ISBN 9781118559376.
  13. Hyperpituitarism~treatment at eMedicine
  14. "National Guideline Clearinghouse | Acromegaly: an Endocrine Society clinical practice guideline". www.guideline.gov. Archived from the original on 2015-09-07. Retrieved 2015-08-25.
  15. MedlinePlus Encyclopedia: Cushing disease

Further reading
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