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Pituitary Tumors

What are pituitary tumors?

Although rare, most pituitary tumors are non-cancerous (benign). However, because of the location of the pituitary gland, at the base of the skull, a pituitary tumor grows upward. And, eventually, most pituitary tumors press against the optic nerves, causing vision problems.

What are symptoms of pituitary tumors?

Symptoms vary depending upon what type of tumor is growing and what area of the pituitary gland is affected. Pituitary tumors can cause symptoms which are associated with excess production of pituitary hormones and symptoms associated with reduced production of pituitary hormones. Each individual also experiences symptoms differently, and the symptoms many resemble other conditions or medical problems. Always consult your physician for a diagnosis.

Causes and types of tumors:

Researchers do not know at this time what causes pituitary tumors.

The most common type of pituitary tumor is called an endocrine inactive tumor, which destroys some of the hormone-producing cells in the pituitary. An endocrine inactive tumor causes hypopituitarism, or an underactive pituitary gland, which may lead to failure of sexual function, reduced sperm production, and cessation of a woman's menstrual period.

Another common pituitary tumor is called a prolactinoma, a benign tumor that produces the prolactin hormone. Prolactin stimulates breast milk production after childbirth.

Other types of tumors act on other parts of the pituitary, with varying effects.

How are pituitary tumors diagnosed?

In addition to a complete medical history and medical examination, diagnostic procedures for pituitary tumors may include:

• measurement of hormone levels in the blood
• computed tomography (CT or CAT scan) - a non-invasive procedure that takes cross-sectional images of the brain or other internal organs; to detect any abnormalities that may not show up on an ordinary x-ray
• magnetic resonance imaging (MRI) - a non-invasive procedure that produces two-dimensional views of an internal organ or structure, especially the brain or spinal cord

Treatment for pituitary tumors:

Specific treatment for pituitary tumors will be determined by your physician based on:

• your age, overall health, and medical history
• extent of the disease
• your tolerance for specific medications, procedures, or therapies
• expectations for the course of the disease
• your opinion or preference

Treatment may include:

• surgical removal of the tumor
• radiation therapy
• hormone-replacement therapy
• medication (i.e., bromocriptine - a drug which acts on hormone-producing tumors to suppress its hormone-producing function)

Click here to view the
Online Resources of Endocrinology

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