Electrode Tract Oedema in Stereo-Electroencephalography.

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.