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. The growths can lead to vision problems because it is near the eyes. It can also lead to growth problems. It often can also disrupt the hormonal balance of the thyroid, adrenal, and gonads.

Pituitary Gland
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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.