A 56 year-old previously healthy man presents with a two month history of a rapidly progressive dementia and abnormal movements. Initially he displayed memory loss, mood changes, and errors in judgment, and difficulties with his gait & balance. On your exam he is mute, stuperous, spastic and rigid with generalized myoclonus. There is a family history of presenile dementia. His CSF shows a slightly elevated protein, but is otherwise normal.
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