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Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study
Published on: August 15, 2025
Delayed complication after Gamma Knife surgery for mesial temporal lobe epilepsy.
Kenichi Usami1, Kensuke Kawai, Tomoyuki Koga
1Department of Neurosurgery, The University of Tokyo Hospital, Tokyo, Japan. usaken-tky@umin.ac.jp
Journal of Neurosurgery
|March 27, 2012
Summary
Gamma Knife surgery (GKS) for refractory mesial temporal lobe epilepsy (MTLE) can control seizures but carries a significant risk of symptomatic radiation necrosis (SRN) years later. Careful evaluation of risks versus benefits is crucial.
Area of Science:
- Neurosurgery
- Radiation Oncology
- Epilepsy Treatment
Background:
- Gamma Knife surgery (GKS) is a less invasive alternative to resection for refractory mesial temporal lobe epilepsy (MTLE).
- The long-term clinical significance and complications of GKS for MTLE remain debated.
Purpose of the Study:
- To report long-term outcomes and complications of GKS in patients with refractory MTLE.
- To evaluate the risk of symptomatic radiation necrosis (SRN) following GKS for MTLE.
Main Methods:
- Seven patients with MTLE underwent GKS between 1996 and 1999.
- Dose prescription varied, with 18 Gy or 25 Gy (50% marginal dose) delivered to medial temporal structures.
Main Results:
- High-dose GKS (25 Gy) achieved seizure abolition in 2 patients and significant reduction in 2 others.
- Two patients developed symptomatic radiation necrosis (SRN) requiring resection 5 and 10 years post-treatment.
- One patient showed MRI evidence of radiation necrosis without symptoms 10 years after GKS.
Conclusions:
- High-dose GKS can provide sufficient seizure control for refractory MTLE.
- Delayed SRN is a significant complication, potentially linked to excessive target volume.
- The clinical utility of GKS for MTLE must weigh seizure control against the risks of delayed complications like SRN.
