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Early and delayed MR and PET changes after selective temporomesial radiosurgery in mesial temporal lobe epilepsy
1Department of Stereotactic and Functional Neurosurgery, La Timone Hospital, Marseille, France.
Abstract:
We report a patient with medically refractory mesial temporal lobe epilepsy treated by gamma knife radiosurgery. In lieu of a microsurgical procedure, an entorhinoamygdalohippocampectomy was performed with a gamma knife and low marginal doses (25 Gy). The clinical and imaging studies, including CT, MR imaging, 18F-fluorodeoxyglucose positron emission tomography (FDG-PET), and long-term follow-up MR examinations, are reported. The patient has been seizure-free since the day of treatment, with no clinical complications. MR studies accurately depicted the effect on the target structures and the transient secondary changes around them. FDG-PET scans showed decreased metabolism after gamma knife surgery throughout the anteromesial part of the epileptogenic temporal lobe. This metabolic decrease was reversible in the lateral temporal cortex. Our case suggests that gamma knife surgery is a promising tool for use as a minimally invasive approach to the treatment of epilepsy.
Insights
Gamma knife radiosurgery offers a minimally invasive treatment for refractory epilepsy. This approach successfully rendered a patient seizure-free with no complications, demonstrating its potential.
Area of Science:
- Neurosurgery
- Epileptology
- Radiosurgery
Background:
- Medically refractory mesial temporal lobe epilepsy presents significant treatment challenges.
- Gamma knife radiosurgery offers a minimally invasive alternative to traditional microsurgery.
Observation:
- A patient with refractory epilepsy underwent gamma knife radiosurgery for entorhinoamygdalohippocampectomy.
- Low marginal doses (25 Gy) were utilized during the procedure.
Findings:
- The patient achieved complete seizure freedom immediately post-treatment.
- Magnetic resonance (MR) imaging confirmed targeted effects and transient surrounding changes.
- 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) revealed decreased metabolism in the epileptogenic zone, with reversibility in the lateral temporal cortex.
Implications:
- Gamma knife surgery shows promise as a minimally invasive therapeutic option for epilepsy.
- This technique allows for precise targeting and monitoring of treatment effects.
- Further research is warranted to explore the broader application of gamma knife radiosurgery in epilepsy management.