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Gamma knife surgery for mesial temporal lobe epilepsy
1Stereotactic and Functional Neurosurgery Department, Timone Hospital, Orsay, France. jregis@ap-hm.fr
Purpose:
Gamma knife radiosurgery (GK) allows precise and complete destruction of chosen target structures containing healthy and/or pathologic cells, without significant concomitant or late radiation damage to adjacent tissues. All the well-documented radiosurgery of epilepsy cases are epilepsies associated with tumors or arteriovenous malformations (AVMs). Results prompted the idea to test radiosurgery as a new way of treating epilepsy without space-occupying lesions.
Methods:
To evaluate this new method, we selected seven patients with drug-resistant "mesial temporal lobe epilepsy" (MTLE). The preoperative evaluation program was the one we usually perform for patients selected for microsurgery of TLE [video-EEG analysis of seizures, foramen ovale electrode recording, magnetic resonance imaging (MRI) positron emission tomography (PET) scan, neuropsychological testing]. In lieu of microsurgery, the amygdalohippocampectomy was performed by using GK radiosurgery.
Results:
Morphologic (MRI) signs of destruction of the target took place at 9 months after GK surgery. Since the treatment day, the first patient has been seizure free. Seizure improvement came more gradually for the following patients, and complete cessation of seizures occurred around the tenth month (range, 8-15 months). MRI shows that the amygdaloentorhinohippocampal target was selectively injured. No significant side effect (except one case of homologous quadrantanopia) or morbidity and no mortality was observed. The current follow-up is 24-61 months, and all (but one) patients are seizure free.
Conclusions:
This initial experience proves clearly the short-to middle-term efficiency and safety of GK for MTLE surgery. These results need further confirmation of long-term efficiency, but the introduction of GK surgery into epilepsy surgery can reduce dramatically its invasiveness and morbidity.
Insights
Gamma Knife radiosurgery offers a less invasive treatment for mesial temporal lobe epilepsy (MTLE). This epilepsy surgery effectively achieved seizure freedom in most patients within a year, with minimal side effects.
Area of Science:
- Neurosurgery
- Radiation Oncology
- Epileptology
Background:
- Gamma Knife (GK) radiosurgery enables precise destruction of target tissues with minimal damage to surrounding areas.
- Previous radiosurgery for epilepsy involved tumors or arteriovenous malformations.
- The study explored GK radiosurgery for epilepsy without space-occupying lesions.
Purpose of the Study:
- To evaluate the efficacy and safety of GK radiosurgery as a novel treatment for epilepsy.
- To investigate GK radiosurgery as an alternative to traditional microsurgery for drug-resistant mesial temporal lobe epilepsy (MTLE).
Main Methods:
- Seven patients with drug-resistant MTLE underwent a comprehensive preoperative evaluation.
- Amygdalohippocampectomy was performed using GK radiosurgery instead of microsurgery.
- Standard presurgical protocols for temporal lobe epilepsy (TLE) were utilized.
Main Results:
- MRI confirmed targeted destruction of the amygdaloentorhinohippocampal region 9 months post-GK.
- Seizure freedom was achieved in most patients between 8-15 months after treatment.
- No significant morbidity or mortality was observed; one patient experienced quadrantanopia.
Conclusions:
- GK radiosurgery demonstrates short-to-middle-term efficacy and safety for MTLE.
- This approach significantly reduces the invasiveness and morbidity associated with epilepsy surgery.
- Further long-term studies are needed to confirm sustained efficacy.