Movement Disorders USMLE Step 1 Practice Question
A 44-year-old concert violinist presents with a 6-month history of painful involuntary flexion and abnormal posturing of the right hand exclusively during performance. Vital signs are normal (BP 128/82, HR 72, RR 14, Temp 37°C). Neurologic examination reveals focal dystonia of the right hand with preserved strength and reflexes; cranial nerves and gait are normal. Brain MRI shows no structural abnormalities. He denies tremor at rest. Which of the following is the most likely diagnosis?
Answer choices
- AHemiballismus
- BDrug-induced parkinsonism
- CEssential tremor
- DMyoclonus
- EFocal dystoniaCorrect answer
- FTask-specific tremor
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