pituitary adenoma

Pituitary adenomas are tumors that occur in the pituitary gland, and account for about 10% of intracranial neoplasms. They often remain undiagnosed, and small pituitary tumors are found in 6 to 24 percent of adults at autopsy.
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Adenoma /ad·e·no·ma/ a benign epithelial tumor in which the cells form recognizable glandular structures or in which the cells are derived from [more]Pituitary adenoma - Community and Resources

A benign tumor of the pituitary, the master gland that controls other glands and influences numerous body functions including growth.