The goal of this retrospective observational study is to describe the efficacy of focused ultrasound ventral-intermediate nucleus thalamotomy in patients with atypical parkinsonism. * Is this treatment efficacious in patients with multiple system atrophy? * Is this treatment efficacious in patients with diffuse Lewy Body Dementia? Data will be collected from patients charts.
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Clinical Rating Scale for Tremor
Timeframe: baseline, pre-procedure, 1 month, 6 months and 1 year following procedure