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Updated: Nov 3, 2025
Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study
Published on: August 15, 2025
Surgical Outcomes and EEG Prognostic Factors After Stereotactic Laser Amygdalohippocampectomy for Mesial Temporal
Shasha Wu1, Naoum P Issa1, Maureen Lacy2
1Department of Neurology, The University of Chicago, Chicago, IL, United States.
Abstract:
Objective: To assess the seizure outcomes of stereotactic laser amygdalohippocampectomy (SLAH) in consecutive patients with mesial temporal lobe epilepsy (mTLE) in a single center and identify scalp EEG and imaging factors in the presurgical evaluation that correlate with post-surgical seizure recurrence. Methods: We retrospectively reviewed the medical and EEG records of 30 patients with drug-resistant mTLE who underwent SLAH and had at least 1 year of follow-up. Surgical outcomes were classified using the Engel scale. Univariate hazard ratios were used to evaluate the risk factors associated with seizure recurrence after SLAH. Results: The overall Engel class I outcome after SLAH was 13/30 (43%), with a mean postoperative follow-up of 48.9 ± 17.6 months. Scalp EEG findings of interictal regional slow activity (IRSA) on the side of surgery (HR = 4.05, p = 0.005) and non-lateralizing or contra-lateralizing seizure onset (HR = 4.31, p = 0.006) were negatively correlated with postsurgical seizure freedom. Scalp EEG with either one of the above features strongly predicted seizure recurrence after surgery (HR = 7.13, p < 0.001) with 100% sensitivity and 71% specificity. Significance: Understanding the factors associated with good or poor surgical outcomes can help choose the best candidates for SLAH. Of the variables assessed, scalp EEG findings were the most clearly associated with seizure outcomes after SLAH.
Insights
Stereotactic laser amygdalohippocampectomy (SLAH) for mesial temporal lobe epilepsy (mTLE) achieved good seizure control in 43% of patients. Scalp EEG findings, particularly interictal regional slow activity and non-lateralizing seizure onset, predicted recurrence.
Area of Science:
- Neurosurgery
- Epileptology
- Clinical Neurology
Background:
- Mesial temporal lobe epilepsy (mTLE) is a common cause of drug-resistant epilepsy.
- Stereotactic laser amygdalohippocampectomy (SLAH) offers a minimally invasive surgical option for mTLE.
- Predicting surgical success in mTLE remains a clinical challenge.
Purpose of the Study:
- To evaluate seizure outcomes following SLAH in patients with drug-resistant mTLE.
- To identify presurgical scalp EEG and imaging predictors of seizure recurrence after SLAH.
Main Methods:
- Retrospective review of 30 drug-resistant mTLE patients undergoing SLAH with ≥1 year follow-up.
- Surgical outcomes assessed using the Engel scale.
- Univariate Cox proportional hazards models analyzed risk factors for seizure recurrence.
Main Results:
- 43% (13/30) of patients achieved Engel class I outcome (seizure freedom).
- Interictal regional slow activity (IRSA) on the surgical side and non-lateralizing/contralateral seizure onset predicted poor outcomes.
- These scalp EEG findings combined strongly predicted seizure recurrence (HR=7.13, p<0.001).
Conclusions:
- SLAH can be effective for select mTLE patients, but recurrence is a concern.
- Presurgical scalp EEG findings are significant predictors of SLAH outcomes.
- Identifying specific EEG patterns can guide patient selection for SLAH.
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