Reoperation after failed resective epilepsy surgery in children

Area of Science:

• Pediatric Neurosurgery
• Epileptology
• Clinical Neurology

Background:

• Epilepsy surgery is effective, but 20-40% of patients experience persistent seizures due to incomplete resection.
• Reoperation is a potential strategy to eliminate or improve intractable seizures.

Purpose of the Study:

• To evaluate seizure outcomes in pediatric patients undergoing repeat epilepsy surgery.
• To identify factors influencing seizure control after reoperation.

Main Methods:

• Retrospective analysis of pediatric patients undergoing second or third epilepsy surgeries (2001-2013).
• Preoperative evaluation included MRI, video EEG, and MEG in most cases.
• Surgical procedures varied, including extended resection, lobectomy, lesionectomy, and functional hemispherotomy.

Main Results:

• 58% of children were seizure-free (ILAE Class 1) one year post-reoperation; 75% had seizure reduction (ILAE Classes 1-4).
• Patients with MEG-identified clustered dipoles showed a trend towards better seizure freedom (71% vs 40%).
• Complete resection of residual lesions correlated with improved outcomes.

Conclusions:

• Reoperation can lead to favorable seizure outcomes in children with recurrent seizures post-initial epilepsy surgery.
• Complete resection of residual lesions is crucial for optimizing seizure control.
• Magnetoencephalography (MEG) should be considered in reevaluation prior to reoperation.