Definition of pituitary tumor - NCI Dictionary of Cancer Terms

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pituitary tumor (pih-TOO-ih-TAYR-ee TOO-mer)

A tumor that forms in the pituitary gland. The pituitary is a pea-sized organ in the center of the brain above the back of the nose. It makes hormones that affect other glands and many body functions, especially growth. Most pituitary tumors are benign (not cancer).

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