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Updated: Aug 8, 2026

Stereo-Electro-Encephalo-Graphy SEEG With Robotic Assistance in the Presurgical Evaluation of Medical Refractory Epilepsy: A Technical Note
Published on: June 13, 2016
Electrode Tract Oedema in Stereo-Electroencephalography
Ming-Sheng Lim1, Rayyan AlBaram2, Aoife Leonard2
1Department of Neurosurgery, Beaumont Hospital, Dublin, Ireland, mingshenglim@rcsi.com.
Introduction:
Stereo-electroencephalography (SEEG) is a safe and effective procedure for the identification of the epileptogenic zone to guide epilepsy surgery. Electrode tract oedema in SEEG is poorly understood. This study reports on its incidence and its clinical and biochemical correlations.
Methods:
The presence of oedema along the electrode tract on patients after removal of SEEG electrodes was recorded and described. The number of electrodes, duration of implantation, and trend of serum inflammatory markers of patients with and without oedema, and with different extents of oedema were compared.
Results:
A total of 79.2% of patients and 34.3% of electrodes were associated with oedema. Two radiographic distributions of oedema are described. No differences were found between the number of electrodes, duration of implantation, and the trends of serum inflammatory markers of patients with and without oedema. The trend of the WCC differed between patients who had diffuse compared to localised oedema, but this difference is unlikely to be clinically significant.
Conclusions:
Radiographic electrode tract oedema is common in SEEG and runs a benign clinical course in our series.
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