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Identifying distinct patterns of refractory orbitofrontal epilepsy is crucial for surgical success. Differentiating orbitofrontal plus frontal from orbitofrontal plus temporal polar epilepsy improves surgical outcomes.

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Area of Science:

  • Neurosurgery
  • Epileptology
  • Neurology

Background:

  • Frontal lobe epilepsy surgery often yields suboptimal results due to incomplete epileptogenic zone resection.
  • Refractory orbitofrontal epilepsy presents complex challenges in surgical planning and execution.

Purpose of the Study:

  • To delineate two distinct anatomo-electro-clinical patterns of refractory orbitofrontal epilepsy.
  • To evaluate the efficacy of tailored surgical approaches for each identified epilepsy pattern.

Main Methods:

  • Eleven patients with refractory orbitofrontal epilepsy underwent stereoelectroencephalography (SEEG) to localize the epileptogenic zone.
  • Preoperative evaluation, SEEG, and postoperative MRI were utilized. Analysis included demographics, seizure semiology, imaging, epileptogenic zone location, resection site, pathology, and surgical outcomes.
  • Surgical outcomes were correlated with the extent of resection.

Main Results:

  • Five patients with orbitofrontal plus frontal epilepsy had the epileptogenic zone in the frontal lobe, with 4 achieving seizure freedom (Engel I) and 1 improving (Engel II).
  • Six patients with orbitofrontal plus temporal polar epilepsy, involving the temporal pole, achieved complete seizure freedom (Engel I) after multilobar resection.
  • Focal cortical dysplasia was confirmed in all cases, with no reported complications or mortality.

Conclusions:

  • Distinguishing between orbitofrontal plus frontal and orbitofrontal plus temporal polar epilepsy is vital for optimizing surgical strategies.
  • Multilobar resection, including the temporal pole, appears to significantly improve outcomes for orbitofrontal plus temporal polar epilepsy with low morbidity.