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Gamma Knife Radiation Therapy for Pituitary Tumors - Candidates for Gamma Knife Treatment

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Gamma Knife radiation treatment for a pituitary tumor is most often used as secondary therapy after surgery. The size and location of the residual tumor are the limiting factors in selecting a patient for this treatment. A large pituitary tumor is usually not appropriate for treatment with the Gamma Knife. In some cases, no obvious tumor is seen on the postoperative MRI scan, but the patient still has excessive hormone production, which should be reduced to normal. In this situation, the entire pituitary gland is usually targeted for treatment. Depending on the type of tumor, excessive hormone production after surgery may occur in 20 to 40% of patients. Gamma Knife treatment may also be appropriate for patients who have an initial remission after surgery and then develop a recurrence of excessive hormone secretion.