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Multiple Endocrine Neoplasia (MEN) I is a hereditary disorder in which one or more of the following glands develop excess normal tissue (hyperplasia) or adenoma (tumor): the parathyroid, the pancreas, the pituitary, and (rarely) the adrenals and thyroid gland. These are all endocrine glands, which produce and secrete hormones into the blood or lymph systems.
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Pituitary Tumor Risk FactorsCertain factors can make one person more likely to get a pituitary tumor than another person. These are called risk factors.
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