Movement Disorders USMLE Step 1 Practice Question
A 69-year-old man presents with a 2-year history of progressive slowness of movement, shuffling gait, and difficulty initiating walking. Vital signs show BP 138/82, HR 76, RR 14, temperature 37°C, and SpO2 98% on room air. Examination reveals cogwheel rigidity and a 4-Hz pill-rolling tremor that decreases with voluntary movement. MRI brain shows no acute abnormalities. He denies recent antipsychotic use. Which of the following is the most likely diagnosis?
Answer choices
- AHemiballismus
- BParkinson diseaseCorrect answer
- CHuntington disease
- DWilson disease
- EEssential tremor
- FDrug-induced parkinsonism
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