The pituitary gland is an endocrine gland that secretes many important hormones that control the activity of many other endocrine glands in the body. Pituitary tumors are tumors that develop from cells of the pituitary gland, and are usually benign and slow-growing. Pituitary tumors are one of the four most common types of tumors in the skull (including brain metastases, meningiomas, gliomas, and pituitary tumors). So are pituitary tumors dangerous? What are the treatments for pituitary tumors?