Movement Disorders USMLE Step 1 Practice Question
A 72-year-old man with Parkinson disease on maximum-tolerated levodopa-carbidopa and ropinirole presents with worsening freezing episodes and bradykinesia. Vital signs: BP 138/82, HR 68, RR 16, Temp 37°C, SpO2 98% on room air. Motor examination reveals rigidity and postural instability; cognition remains intact. Recent MRI shows no structural lesions. Deep brain stimulation is being considered for symptomatic management. Which of the following structures is a common target for this intervention?
Answer choices
- ASubthalamic nucleusCorrect answer
- BCaudate head
- CMammillary body
- DNucleus accumbens
- ELateral geniculate nucleus
- FThalamic ventral intermediate nucleus
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