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Hemiballismus, Hyperphagia, and Behavioral Changes following Subthalamic Infarct.
Masoud Etemadifar1, Seyed-Hossein Abtahi, Seyed-Mojtaba Abtahi
1Department of Neurology, Medical School, Isfahan University of Medical Sciences, Isfahan 81744-176, Iran.
Damage to the subthalamic nucleus (STN) can cause hemiballismus and behavioral changes. This case highlights STN infarction leading to motor and non-motor symptoms, suggesting its role in cognitive and emotional regulation.
Area of Science:
- Neuroscience
- Neurology
- Neuroanatomy
Background:
- The subthalamic nucleus (STN) is a key component of the basal ganglia system.
- Its precise function remains unclear, but it is hypothesized to be involved in action selection.
- Unilateral STN damage, often from small vessel stroke, typically results in hemiballismus or hemichorea-hemiballismus.
Purpose of the Study:
- To report a case of hemiballismus and associated behavioral changes due to STN infarction.
- To explore the potential role of the STN in non-motor functions based on observed symptoms.
Main Methods:
- Case study of a 60-year-old patient presenting with sudden onset abnormal movements.
- Clinical observation of motor, appetite, mood, and behavioral changes.
- Magnetic resonance imaging (MRI) to identify the infarct area.
Main Results:
- The patient exhibited right-sided hemiballismus, hyperphagia, and significant mood/behavioral alterations including aggressiveness, irritability, and anxiety.
- MRI revealed an infarct in the left subthalamic region.
- The symptoms correlated with the location of the infarction in the left STN.
Conclusions:
- Infarction of the left subthalamic nucleus caused hemiballismus in this patient.
- The observed non-motor symptoms (irritability, anxiety, behavioral changes) suggest the STN's involvement in cognitive and emotional regulation.
- This case underscores the STN's broader role beyond motor control.
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