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In this rat hippocampal epilepsy model, stereotactic radiosurgery was followed by a significant dose-dependent reduction in the frequency of observed and EEG-defined seizures. These effects were not accompanied by increased radiation-induced structural or metabolic brain injury as assessed by proton and sodium MRI or histological examination. The role of radiosurgery as a new, nondestructive surgical therapy for idiopathic epilepsy warrants further investigation.