The pituitary is a small complicated gland at the base of the brain. It makes several important hormones that regulate growth and the activity of several other major glands throughout the body. A pituitary adenoma is an abnormal growth, or tumor, in this gland. Pituitary adenomas are usually benign. This means they are not cancerous. They do not spread to other parts of the body. They can lead to vision problems because they are near the eyes. A pituitary adenoma can also lead to growth problems. It often can also disrupt the hormonal balance of the thyroid, adrenal, and gonad glands.
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The cause is unknown. Some tumors are part of other endocrine disorders and are associated with genetic changes. These can be inherited.
Tumors can also be a result of exposure to cancer-causing substances or radiation. In some cases, the DNA changes may occur for no known reason.
Factors that may increase your chance of pituitary adenoma include:
A family or personal history of
multiple endocrine neoplasia, type 1 (MEN1)—a hereditary condition that increases the risk of developing pituitary, hypothalamus, and parathyroid and pancreatic tumors
Other inherited disorders such as Carney complex, acromegaly, or gigantism
Symptoms can vary and may not be present at all. It will depend on whether the tumor is secreting hormones and how large it is. The tumor's location at the base of the brain can also cause symptoms.
General symptoms due to size may include: HeadacheBlurred vision or tunnel vision
In addition to the above, symptoms from prolactin-secreting adenoma: Milk production in nonlactating womenLoss of or irregular periodsLack of interest in sexVaginal dryness
Symptoms from thyrotropin-secreting adenoma: Swelling of the neck
Symptoms of hyperthyroidism: TremorsRapid heartbeatAnxietyWeight lossInsomnia
Symptoms from corticotropin-secreting adenoma: Menstrual disturbanceSkin changes—increased facial hair, acne, bruising, or bluish stretch marksBuffalo hump—increased fatty tissue in backObesity, especially around the wristRound face
Growth hormone-secreting adenoma: Enlarged hands and feetExcessive growth and heightOily skinExcess sweating
Pituitary adenomas may also be associated with the following conditions:
DiabetesKidney stonesCardiovascular diseaseHigh blood pressureOsteoporosis
You will be asked about your symptoms and medical history. A physical exam will be done. You will be referred to an endocrinologist. This is a doctor who specializes in glands and hormones.
Your bodily fluids may be tested. This can be done with: Blood testsUrine tests
Your peripheral vision may be tested. This can be done with visual field tests.
Images may be taken of your bodily structures. This can be done with an MRI scan.
Treatment depends on the presence and type of hormones being secreted. It is not uncommon for these treatment options to be used in combination. Talk with your doctor about the best plan for you.
Treatment options include:
Surgery is often done to remove the tumor. The rest of the normal pituitary gland may be damaged during surgery. This can be treated with hormone replacement.
Medications can control symptoms and sometimes shrink the tumor. They can block hormone secretion.
For the majority of adenomas, that are prolactin or growth hormone-secreting, medications may include: Dopamine agonistsOctreotide or long-acting versions
Radiation therapy involves the use of radiation to kill tumor cells. The types of radiation therapy used to treat pituitary adenomas include: Conventional therapy—radiation is directed at the pituitary from a source outside the bodyStereotactic radiosurgery—an intense radiation beam is targeted directly at the tumorProton beam radiotherapy—a beam of protons (positively charged particles) is directly focused on the tumor
There are no current guidelines to prevent a pituitary adenoma.
Becker A, Daly AF. The clinical, pathological, and genetic features of familial isolated pituitary adenomas.
Eur J Endocrinol
Beshay VE, Beshay JE, Halvorson LM. Pituitary tumors: diagnosis, management, and implications for reproduction.
Semin Reprod Med
General information about pituitary tumors. National Cancer Institute website. Available at:
http://www.cancer.gov/types/pituitary/patient/pituitary-treatment-pdq. Updated January 3, 2014. Accessed February 27, 2014.
NINDS pituitary tumors information page. National Institute of Neurological Disorders and Stroke website. Available at:
http://www.ninds.nih.gov/disorders/pituitary_tumors/pituitary_tumors.htm. Updated February 14, 2014. Accessed February 27, 2014.
Pituitary tumors. American Cancer Society website. Available at:
http://www.cancer.org/acs/groups/cid/documents/webcontent/003133-pdf.pdf. Accessed February 27, 2014.
Last reviewed February 2016 by Kim Carmichael, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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