Aug 2026· Journal of clinical neurophysiology· 0 citations· 13 references
Medicine
TL;DR
The data suggest that mesial temporal lobe epilepsy can be subdivided according to whether the hippocampal onset pattern is focal or nonfocal, and that targeting localized seizure onset zones within the hippocampus can be effective for seizure control, while limiting surgical morbidity and potentially the risk of adverse cognitive outcomes.
Abstract
SUMMARY
In mesial temporal lobe epilepsy, resection or ablation-typically of anterior temporal structures-is highly successful in achieving seizure freedom. However, in a substantial proportion of patients, seizures recur for unclear reasons. Invasive hippocampal recordings suggest that, in some patients, hippocampal seizures are highly focal, often restricted to the anterior or posterior hippocampus. This led us to hypothesize that resection or ablation limited to the hippocampal subregion(s) involved at seizure onset is more likely to control seizures than surgery that does not address the specific onset locations. We present a case in which seizures were successfully controlled after posterior hippocampal ablation, as well as a retrospective case series of 18 patients in which 10 cases demonstrated focal onsets within the anterior or posterior hippocampus. Better outcomes occurred when surgery was concordant with the onset region(s) versus discordant (n = 7 concordant vs. 11 discordant patients, P = 0.046, Barnard Exact test). These data suggest that mesial temporal lobe epilepsy can be subdivided according to whether the hippocampal onset pattern is focal or nonfocal, and that targeting localized seizure onset zones within the hippocampus can be effective for seizure control, while limiting surgical morbidity and potentially the risk of adverse cognitive outcomes.
Successful TLE surgery is associated with partial restoration of cholinergic arousal network connectivity, supporting the idea that seizure cessation enables recovery of brain networks disrupted by recurrent seizures.
Addison C Cavender, Derek J. Doss, Ghassan S Makhoul et al.· Epilepsia· 0 citations
The model achieved high specificity in predicting long-term seizure recurrence, which supports its potential clinical utility for postoperative risk stratification and counseling rather than surgical exclusion and underscores the translational potential of network-level biomarkers to complement conventional predictors.
V.Yu. Karpychev, Rebecca W. Roth, William Yun et al.· Neurology· 0 citations
This review examines the evolving landscape of pediatric OLE, highlighting the shift from syndromic to etiological classification and management strategies and the need to monitor cognitive comorbidities and syndrome evolution.
Preeti Srivastava, D. Nag, Shikha Swaroop et al.· World Journal of Clinical Pe...· 0 citations
Four of the six frontotemporal regions showing the largest morphometric alterations in MDD also exhibit reduced cortical thickness in mTLE patients with past or future depression, which supports depression in mTLE as an expression of network pathology common to MDD, while residual regional differences may help explain the distinct phenotypic presentations of depression in these neuropsychiatric disorders.
Philip Fink-Jensen, B. Ozenne, Ane G. Kloster et al.· Epileptic disorders· 0 citations
Purpose Subclinical seizures (SCSs) are commonly detected during video-EEG monitoring but frequently overlooked in clinical practice. Their prevalence, localization characteristics, and relationship to clinical seizures (CSs) and interictal epileptiform discharges (IEDs) remain incompletely defined. This study aimed to characterize SCS prevalence, localization, frequency, and concordance with CS and IED localization in a presurgical epilepsy cohort, and to examine associations between SCS presence and neuropsychological performance. Methods A retrospective observational study was conducted in 116 adult patients undergoing inpatient scalp video-EEG telemetry and neuropsychological evaluation at King’s College Hospital between 2015 and 2023. SCS localization was compared with CS and IED localization using a five-category concordance framework and Cohen’s kappa for lateralization and temporal vs. extratemporal agreement. Results SCSs were present in 26.7% of patients. No clinical or demographic variable was significantly associated with their presence. SCSs most frequently localized to left temporal and right extratemporal regions, whereas CSs were more evenly distributed across temporal foci. Full concordance between CS and SCS localization was observed in 55.2% of co-recorded studies; where incomplete, SCS localizations were more often contained within CS localizations than the reverse. IED localizations were more widespread than both seizure types. Lateralization agreement was moderate across all comparisons (κ = 0.40–0.47). SCS presence was not significantly associated with neuropsychological test scores. Conclusion SCSs are present in approximately one quarter of presurgical epilepsy patients and show moderate concordance with CS and IED localization. Their distinct localization profile and frequent containment within CS zones support their value as complementary information in epilepsy care.
L. Lankhuijzen, Monique Cloherty, J. Winston et al.· Frontiers in Neurology· 0 citations
