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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

609
Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
609
Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

293
Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
293

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Updated: Sep 17, 2025

Author Spotlight: Advancing Pediatric Epilepsy Surgery in Children Through Novel Biomarkers and Enhanced Localization
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Extratemporal epilepsies mimicking temporal mesial epilepsy.

D Taussig1, A M Petrescu1, A Herbrecht2

  • 1Université Paris Saclay-APHP, Neurophysiologie et Epileptologie, Le Kremlin Bicêtre, France.

Epilepsy & Behavior : E&B
|July 1, 2025
PubMed
Summary

Many patients with drug-resistant epilepsy initially suspected as having mesial temporal lobe epilepsy actually have extratemporal seizure onsets. Stereoelectroencephalography (SEEG) is crucial for accurate diagnosis, revealing parietal or frontal origins in these cases.

Keywords:
AdultsChildrenEpilepsy surgeryPosterior cingulumStereoelectroencephalography

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Area of Science:

  • Neurology
  • Neurosurgery
  • Epileptology

Background:

  • Approximately 30% of patients with focal seizures exhibiting mesial temporal semiology continue to experience seizures post-anterior temporal resection.
  • Unrecognized extratemporal seizure onset is a significant factor contributing to persistent seizures after surgery.
  • Accurate localization of seizure onset is critical for effective epilepsy treatment.

Purpose of the Study:

  • To investigate cases where clinical semiology suggested mesial temporal epilepsy but stereoelectroencephalography (SEEG) revealed extratemporal seizure origins.
  • To highlight the limitations of non-invasive diagnostic methods in accurately identifying seizure onset zones in complex epilepsy cases.
  • To emphasize the importance of SEEG in diagnosing drug-resistant epilepsy with atypical semiology.

Main Methods:

  • Retrospective analysis of six patients with drug-resistant epilepsy and mesial temporal semiology from three tertiary care centers.
  • Confirmation of seizure onset using stereoelectroencephalography (SEEG).
  • Review of non-invasive investigations including video-electroencephalograms (EEG) and positron emission tomography (PET)-scans.

Main Results:

  • SEEG identified extratemporal seizure onsets in all six patients initially suspected of having mesial temporal epilepsy.
  • Five patients were diagnosed with mesial parietal epilepsy, and one with fronto-polar epilepsy upon SEEG confirmation.
  • Non-invasive data were misleading in several cases, suggesting temporal lobe epilepsy or mesial parietal epilepsy, underscoring diagnostic challenges.

Conclusions:

  • Clinical semiology alone can be deceptive, leading to misdiagnosis of mesial temporal epilepsy when the origin is extratemporal.
  • Stereoelectroencephalography (SEEG) is essential for accurate localization in drug-resistant epilepsy cases where non-invasive methods are inconclusive.
  • Prospective studies investigating the systematic use of specific electrodes in SEEG for non-lesional temporal lobe epilepsy are warranted.