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Updated: Apr 17, 2026
Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study
Published on: August 15, 2025
Morphometric MRI alterations and postoperative seizure control in refractory temporal lobe epilepsy
Simon S Keller1, Mark P Richardson, Jonathan O'Muircheartaigh
1Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom; Department of Radiology, The Walton Centre NHS Foundation Trust, Liverpool, United Kingdom; Department of Clinical Neuroscience, Institute of Psychiatry, King's College London, London, United Kingdom.
Refractory mesial temporal lobe epilepsy (mTLE) surgery outcomes can be predicted by localized thalamus and hippocampus atrophy. Preoperative MRI shape analysis identifies patients likely to have persistent seizures, guiding personalized epilepsy treatment strategies.
Area of Science:
- Neurology
- Neurosurgery
- Radiology
Background:
- Refractory mesial temporal lobe epilepsy (mTLE) affects many patients despite resective surgery, with 40-50% experiencing persistent seizures.
- Identifying reliable prognostic markers for postoperative seizure outcomes is critical for epilepsy research and patient management.
Purpose of the Study:
- To investigate preoperative MRI-based imaging markers, specifically cortical thickness and subcortical surface shape, to predict postoperative seizure outcomes in patients with mTLE.
- To determine if conventional volumetric analysis can differentiate between patients with excellent and suboptimal surgical outcomes.
Main Methods:
- Analyzed preoperative MRI scans of 115 patients with mTLE and hippocampal sclerosis and 80 healthy controls.
- Utilized surface shape analysis to detect localized atrophy in subcortical structures.
- Compared imaging findings between patients with excellent (ILAE I) and suboptimal (ILAE II-VI) postoperative seizure outcomes.
Main Results:
- Conventional volumetry of hippocampal and other subcortical structures did not differentiate between outcome groups.
- Surface shape analysis revealed localized bilateral thalamic atrophy and contralateral posterior/lateral hippocampal atrophy in patients with persistent postoperative seizures.
- Focal ipsilateral hippocampal atrophy posterior to resection margins was also observed in patients with persistent seizures (uncorrected data).
Conclusions:
- Persistent postoperative seizures in mTLE are associated with localized preoperative shape alterations in a bihemispheric thalamohippocampal network.
- Surface shape analysis of the thalamus and hippocampus shows potential as a prognostic imaging biomarker for mTLE surgery.
- Future imaging assessments should focus on this thalamohippocampal network for predicting individual patient outcomes in refractory mTLE.
