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Prolonged focal negative motor seizures: a video-EEG study
Flavio Villani1, Domenico D'Amico, Alessandro Pincherle
1Division of Clinical Epileptology, Instituto Nazionale Neurologico "C. Besta", Milan, Italy. fvillani@istituto-besta.it
Purpose:
Focal negative motor (akinetic) seizures are rare ictal events that are diagnostically challenging because they are difficult to differentiate from postictal Todd paresis, transient ischemic attacks, migraine events, and psychogenic episodes.
Methods:
We describe a 45-year-old man in whom, after surgical drainage of a right frontoparietal subdural hematoma, prolonged episodes developed with flaccid paralysis of the left arm.
Results:
A video-EEG recording demonstrated a close relation between the focal motor impairment and a clear-cut epileptic ictal discharge involving the right perirolandic cortical areas.
Conclusions:
On the basis of the electroclinical data, we hypothesize the involvement of the primary motor area in the genesis of the epileptic discharge triggering focal negative seizures.
Insights
Focal negative seizures, characterized by temporary paralysis, can be challenging to diagnose. This study links these rare events to epileptic discharges in the primary motor cortex.
Area of Science:
- Neurology
- Epileptology
- Neurophysiology
Background:
- Focal negative motor seizures are rare and often misdiagnosed.
- Differential diagnosis includes Todd paresis, TIAs, migraines, and psychogenic episodes.
Observation:
- A case study of a 45-year-old man with a right frontoparietal subdural hematoma.
- The patient experienced prolonged episodes of left arm flaccid paralysis.
Findings:
- Video-EEG confirmed a link between motor impairment and epileptic discharges.
- The epileptic activity originated in the right perirolandic cortical areas.
Implications:
- Suggests primary motor area involvement in triggering focal negative seizures.
- Highlights the importance of electroencephalography in diagnosing these rare seizure types.
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