MRgLITT Versus Resective Surgery for FCD II and TSC Epilepsy

What was studied

This systematic review and meta-analysis compared two procedures for drug-resistant epilepsy caused by MRI-positive focal cortical dysplasia type II (FCD II) or tuberous sclerosis complex (TSC). It included 36 studies: 25 studies of resective surgery involving 1,220 patients and 13 studies of MR-guided laser interstitial thermal therapy (MRgLITT) involving 87 patients. Two studies reported data on both procedures.

The main outcome was freedom from seizures after treatment. The researchers also compared complication rates and examined outcomes by age at surgery: younger than 18 versus 18 or older.

What they found

For FCD II and TSC combined, seizure-freedom rates were 72% after MRgLITT and 71% after resective surgery. For FCD II alone, the rates were 74% and 85%, respectively. For TSC alone, they were 50% and 59%. None of these differences was statistically significant.

The analysis also found no statistically significant difference in complication rates between the procedures for the combined FCD II/TSC group. The age-based subgroup analysis found no statistically significant difference in seizure freedom.

Limits of the evidence

A lack of statistical significance does not prove that the treatments are equally effective or safe. The MRgLITT evidence involved 87 patients, compared with 1,220 patients treated with resective surgery, and only two studies reported data on both procedures. This should be considered when interpreting the comparisons.

The abstract does not provide follow-up periods, individual study quality results, details about possible differences in patient selection, or the types and severity of complications. These details are important for assessing the findings.

For families and caregivers

Both procedures were associated with seizure freedom in some people with MRI-positive FCD II or TSC. This review found no statistically significant differences between MRgLITT and resective surgery in seizure freedom or in complication rates for the combined group, but it does not establish that the procedures are equally suitable for every patient. Individual treatment decisions require clinical evaluation.

What to watch next

Larger studies directly comparing MRgLITT with resective surgery in similar patients, with clearly reported long-term seizure outcomes and complications, would strengthen the evidence.

Terms in this summary

Drug-resistant epilepsy

Epilepsy in which seizures continue despite appropriate trials of antiseizure medicines.

Focal cortical dysplasia type II

A structural brain abnormality that can cause epilepsy.

Tuberous sclerosis complex

A condition that can affect the brain and is a structural cause of epilepsy.

MRgLITT

Magnetic resonance-guided laser interstitial thermal therapy, which uses MRI guidance and heat to target brain tissue.

Resective surgery

An operation that removes brain tissue associated with seizures.

Seizure freedom

Having no seizures during the follow-up period defined by a study.

Meta-analysis

A statistical method that combines results from multiple studies.

Statistically significant

A result considered unlikely to be explained by chance under a study's statistical assumptions.