Posterior quadrant disconnection for sub-hemispheric drug refractory epilepsy

Area of Science:

• Neurosurgery
• Epileptology
• Medical Imaging

Background:

• Posterior quadratic epilepsy (PQE) is a multilobar epilepsy affecting the temporal-parietal and occipital lobes.
• Etiologies include gliosis, cortical dysplasia, and Sturge-Weber syndrome.
• Preoperative workup involves EEG, SPECT, PET, and MEG to pinpoint the epileptogenic focus.

Observation:

• Traditional multi-lobar resections for PQE carried high risks of morbidity and mortality.
• The concept of disconnection surgery, like functional hemispherectomy, emerged to manage extensive hemispheric pathologies.
• Minimally invasive techniques like endoscopic vertical hemispherotomy have advanced disconnection procedures.

Findings:

• Posterior quadrant disconnection (PQD) is a specialized disconnection technique for refractory epilepsy originating in the posterior quadrant.
• PQD principles are analogous to peri-insular hemispherotomy.
• This abstract outlines the step-wise surgical technique for PQD.

Implications:

• PQD provides a refined surgical option for managing specific types of refractory epilepsy.
• Advances in disconnection techniques aim to reduce surgical morbidity.
• Detailed descriptions and visual aids enhance the understanding and application of PQD surgery.