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Two days ago my mother underwent gamma knife radiosurgery at Washington University (Barnes Hospital). A stereotactic lesion was made in the globus pallidus. She has had PD for 30 years and had recently reached the point where even very small amounts of PD medications caused major dyskinesia/dystonia that was unrelenting. Has anyone on this list had experience with this procedure? If so, please describe the outcome of the procedure and the time before any change was perceived. Thank you very much for any assistance provided. Sandy