- A neurologic syndrome usually resulting from deficiency of the neurotransmitter dopamine as the consequence of degenerative, vascular, or inflammatory changes in the basal ganglia; characterized by rhythmic muscular tremors, rigidity of movement, festination, droopy posture, and masklike facies.
- A syndrome similar to parkinsonism. Some features seen with Parkinson disease that occur with other disorders (progressive supranuclear palsy) or as a side effect of certain medications (antipsychotic drugs).
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