seizure focus
The specific brain region where abnormal electrical activity originates during an epileptic seizure.
Full Definition
A seizure focus, also known as an epileptogenic focus, is the anatomically discrete brain area where seizures originate due to abnormal neuronal hyperexcitability. Identification of the seizure focus is crucial for surgical treatment planning in patients with refractory epilepsy. The focus can be localized through various methods including scalp and intracranial EEG monitoring, neuroimaging studies, and neuropsychological testing. Successful surgical resection of the seizure focus can lead to seizure freedom in appropriately selected patients, though the procedure requires careful consideration of potential functional deficits.
Usage
Usage note: Distinguish from seizure spread patterns and other epilepsy-related zones.
In Context
- "Intracranial EEG monitoring successfully localized the seizure focus to the left temporal lobe." — Presurgical evaluation report
- "PET imaging showed hypometabolism in the region corresponding to the suspected seizure focus." — Nuclear medicine report