Stereotactic radiosurgery is being used to create functional lesions in patients with movement disorders that were once only created with "open" Stereotactic neuro-surgical techniques. Patients with Parkinson disease (PD), essential tremor (ET), dystonias, and tremors of other origins are being treated worldwide using such technology. We have found over the years, however, that our attempt to make this type of brain surgery less and less invasive can come at a cost. Without intraop-erative physiologic feedback, the radiosurgical lesion is targeted based on anatomy alone, which is variable between patients.
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