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Related Experiment Video

Updated: Sep 15, 2025

Stereo-Electro-Encephalo-Graphy SEEG With Robotic Assistance in the Presurgical Evaluation of Medical Refractory Epilepsy: A Technical Note
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Electrode Tract Oedema in Stereo-Electroencephalography.

Ming-Sheng Lim1, Rayyan AlBaram2, Aoife Leonard2

  • 1Department of Neurosurgery, Beaumont Hospital, Dublin, Ireland, mingshenglim@rcsi.com.

Stereotactic and Functional Neurosurgery
|July 17, 2025
PubMed
Summary

Stereo-electroencephalography (SEEG) electrode tract edema is common, affecting 79.2% of patients, but typically follows a benign clinical course. This finding is crucial for understanding SEEG procedure outcomes.

Keywords:
ElectrodesElectroencephalographyInflammationOedemaStereotactic electroencephalography

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Area of Science:

  • Neurology
  • Neurosurgery
  • Radiology

Background:

  • Stereo-electroencephalography (SEEG) is a key neurosurgical procedure for localizing the epileptogenic zone to guide epilepsy surgery.
  • The occurrence and clinical significance of electrode tract edema following SEEG implantation are not well-understood.
  • This study investigates the incidence, radiographic patterns, and clinical/biochemical correlations of SEEG electrode tract edema.

Purpose of the Study:

  • To determine the incidence and radiographic characteristics of electrode tract edema after SEEG.
  • To explore potential clinical and biochemical correlations associated with SEEG electrode tract edema.
  • To assess the clinical course and significance of edema in patients undergoing SEEG.

Main Methods:

  • Retrospective analysis of patients who underwent SEEG implantation.
  • Recording and description of edema presence and radiographic distribution along electrode tracts post-removal.
  • Comparison of patient demographics, electrode number, implantation duration, and serum inflammatory markers (including White Cell Count - WCC) between edematous and non-edematous groups.

Main Results:

  • Edema was observed in 79.2% of patients and 34.3% of electrodes.
  • Two distinct radiographic distributions of edema were identified.
  • No significant differences in electrode number, implantation duration, or serum inflammatory marker trends were found between patients with and without edema.
  • A minor difference in WCC trends was noted between diffuse and localized edema, deemed clinically insignificant.

Conclusions:

  • Radiographic electrode tract edema is a frequent finding after SEEG procedures.
  • The edema associated with SEEG electrode tracts generally follows a benign clinical course.
  • Findings suggest that SEEG-related edema does not typically lead to adverse clinical outcomes.