The 3-dimensional grid: a novel approach to stereoelectroencephalography

Area of Science:

• Neurosurgery
• Epileptology
• Medical Imaging

Background:

• Accurate localization of seizure onset and eloquent brain is crucial for successful epilepsy surgery.
• Traditional methods like subdural grids and sparse stereoelectroencephalography (SEEG) lack the resolution for precise mapping.

Observation:

• A novel strategy involved dense array depth electrode placement using framed stereotaxy in 20 patients with intractable epilepsy.
• Arrays were designed with parallel electrodes (1 cm spacing) to map seizure foci and eloquent cortex in 3D.
• Electrode trajectories were optimized to avoid cortical vessels identified via MRI.

Findings:

• 254 electrodes were implanted, enabling precise identification of seizure onset zones and functional cortical areas.
• Surgical resection successfully removed epileptogenic tissue while preserving critical eloquent regions.
• No hemorrhagic or infectious complications occurred, and no patients experienced permanent neurological deficits.

Implications:

• The 3D intraparenchymal electrode grid offers a valuable tool for detailed epilepsy focus localization.
• This technique enhances surgical precision, potentially leading to better seizure control and functional preservation in epilepsy patients.