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Updated: Oct 24, 2026
Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study
Published on: August 15, 2025
Temporal lobe developmental malformations and hippocampal sclerosis: epilepsy surgical outcome
R Kuzniecky1, S S Ho, R Martin
1University of Alabama at Birmingham Epilepsy Center, Department of Neurology, University of Alabama at Birmingham, 35294-0021, USA.
Background:
Temporal lobe developmental malformations coexist with mesial temporal sclerosis in the form of dual pathology with a high frequency of bilateral amygdala or hippocampal abnormalities.
Objective:
The aim of this study was to correlate and compare the MRI findings and the surgical outcome in patients with temporal lobe developmental malformations (n = 20) and isolated mesial temporal sclerosis (n = 36).
Methods:
MRI-based normalized volumetry of the amygdala and hippocampal formation in patients with unilateral temporal lobe developmental malformations and isolated mesial temporal sclerosis who underwent temporal lobe resections was performed. Seizure outcome was compared between groups at follow-up.
Results:
The frequency of bilateral hippocampal or amygdala atrophy (p < 0.04) and combined hippocampal-amygdala atrophy (p < 0.02) was higher in patients with temporal lobe developmental malformations. Although no significant difference in postsurgical seizure-free status was found between the temporal lobe developmental malformations and isolated mesial temporal sclerosis groups (70% versus 91%), patients with temporal lobe developmental malformations and bilateral amygdala or hippocampal-amygdala atrophy had a significantly worse outcome (p < 0.02).
Conclusion:
Bilateral hippocampal atrophy is frequent in patients with temporal lobe developmental malformations. However, it is the presence of bilateral amygdala or amygdalo-hippocampal atrophy that is associated with a higher risk of seizure recurrence.
Insights
Temporal lobe developmental malformations often show bilateral hippocampal or amygdala atrophy. This atrophy, particularly in the amygdala, is linked to worse seizure outcomes after surgery for epilepsy.
Area of Science:
- Neurology
- Neurosurgery
- Radiology
Background:
- Temporal lobe developmental malformations frequently co-occur with mesial temporal sclerosis.
- Dual pathology involving bilateral amygdala or hippocampal abnormalities is common.
Purpose of the Study:
- To correlate and compare MRI findings and surgical outcomes.
- To evaluate patients with temporal lobe developmental malformations versus isolated mesial temporal sclerosis.
Main Methods:
- MRI-based normalized volumetry of amygdala and hippocampal formation.
- Comparison of seizure outcomes post-temporal lobe resection.
Main Results:
- Higher frequency of bilateral hippocampal/amygdala atrophy in developmental malformations.
- No significant difference in seizure-free status between groups.
- Worse surgical outcome in developmental malformations with bilateral amygdala/hippocampal-amygdala atrophy.
Conclusions:
- Bilateral hippocampal atrophy is common in temporal lobe developmental malformations.
- Bilateral amygdala or amygdalo-hippocampal atrophy predicts a higher risk of seizure recurrence.
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