Noninvasive testing, early surgery, and seizure freedom in tuberous sclerosis complex

Area of Science:

• Neuroscience
• Medical Imaging
• Epileptology

Background:

• Identifying epileptogenic tubers in tuberous sclerosis complex (TSC) is challenging.
• Noninvasive methods are needed to pinpoint seizure origins in TSC patients.
• Magnetic source imaging (MSI) and FDG-PET/MRI coregistration offer potential solutions.

Purpose of the Study:

• To assess the efficacy of MSI and FDG-PET/MRI coregistration in noninvasively identifying epileptogenic regions in children with TSC.
• To evaluate the correlation between noninvasive imaging findings and surgical outcomes.
• To determine factors associated with postoperative seizure freedom.

Main Methods:

• Twenty-eight children with intractable epilepsy from TSC underwent MSI and FDG-PET/MRI coregistration.
• No extraoperative intracranial EEG was used.
• Surgical resection was performed based on concordant imaging results and confirmed intraoperatively.

Main Results:

• Sixty-four percent (18/28) of patients underwent surgical resection.
• Postoperative seizure freedom was achieved in 67% (12/18) of surgically treated patients.
• Younger age at surgery and shorter seizure duration correlated with seizure freedom; complete removal of MSI dipole clusters also predicted success.

Conclusions:

• MSI and FDG-PET/MRI coregistration effectively localized epileptogenic zones in children with TSC and intractable epilepsy.
• A 67% seizure-free rate was achieved postoperatively, supporting the utility of these noninvasive techniques.
• Early epilepsy surgery in younger patients with shorter seizure duration is associated with better seizure control in TSC.