Mesial temporal lobe epilepsy with hippocampal sclerosis is a rare epilepsy syndrome in which seizures arise from mesial temporal limbic structures and are associated with unilateral or asymmetric hippocampal sclerosis, memory deficits, and a high likelihood of later drug resistance.
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name: Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis
creation_date: '2026-04-05T20:02:37Z'
updated_date: '2026-05-09T19:42:12Z'
description: >-
Mesial temporal lobe epilepsy with hippocampal sclerosis is a rare epilepsy
syndrome in which seizures arise from mesial temporal limbic structures and
are associated with unilateral or asymmetric hippocampal sclerosis, memory
deficits, and a high likelihood of later drug resistance.
category: Complex
parents:
- Temporal Lobe Epilepsy
disease_term:
preferred_term: mesial temporal lobe epilepsy with hippocampal sclerosis
term:
id: MONDO:0020476
label: mesial temporal lobe epilepsy with hippocampal sclerosis
pathophysiology:
- name: Hippocampal Sclerosis
description: >-
The sclerotic hippocampus in MTLE-HS shows severe neuronal loss, prominent
astrocytic gliosis, and reduced synaptic protein abundance, consistent with
structural remodeling of the epileptogenic mesial temporal focus.
cell_types:
- preferred_term: neuron
term:
id: CL:0000540
label: neuron
- preferred_term: astrocyte
term:
id: CL:0000127
label: astrocyte
biological_processes:
- preferred_term: chemical synaptic transmission
term:
id: GO:0007268
label: chemical synaptic transmission
locations:
- preferred_term: Ammon's horn
term:
id: UBERON:0001954
label: Ammon's horn
downstream:
- target: Large-Scale Network Reorganization
description: >-
Structural injury and gliotic remodeling in the sclerotic hippocampus can
drive broader extrahippocampal hub reorganization in MTLE-HS.
evidence:
- reference: PMID:33197783
reference_title: "Proteomic profile differentiating between mesial temporal lobe epilepsy with and without hippocampal sclerosis."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
We confirmed histologically that all MTLE-HS cases examined exhibited
severe neuronal cell loss and remarkable astrocytic gliosis in the
hippocampi.
explanation: >-
Directly supports hippocampal sclerosis as a core lesion characterized by
neuronal loss and astroglial remodeling.
- reference: PMID:33197783
reference_title: "Proteomic profile differentiating between mesial temporal lobe epilepsy with and without hippocampal sclerosis."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
In the sclerotic hippocampus, the expression levels of several synaptic
proteins were decreased, and those of some glia-associated proteins
increased.
explanation: >-
Supports synaptic and glial remodeling within sclerotic hippocampal
tissue in MTLE-HS.
- name: Large-Scale Network Reorganization
description: >-
MTLE-HS behaves as a distributed network disorder in which both hippocampal
and extrahippocampal hubs are reorganized, rather than as an isolated focal
lesion.
biological_processes:
- preferred_term: transmission of nerve impulse
term:
id: GO:0019226
label: transmission of nerve impulse
locations:
- preferred_term: Ammon's horn
term:
id: UBERON:0001954
label: Ammon's horn
- preferred_term: cerebral cortex
term:
id: UBERON:0000956
label: cerebral cortex
evidence:
- reference: PMID:25809843
reference_title: "Mesial temporal lobe epilepsy with hippocampal sclerosis is a network disorder with altered cortical hubs."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Because we detected network hubs in both hippocampal and
extrahippocampal areas, it is probable that mTLE is a large-scale
network disorder rather than a focal disorder.
explanation: >-
Supports the view that MTLE-HS involves distributed network-level
reorganization extending beyond the hippocampus.
phenotypes:
- name: Seizures
category: Neurological
frequency: VERY_FREQUENT
diagnostic: true
description: >-
Recurrent focal seizures arise from mesial temporal limbic structures and
commonly progress to impaired awareness with automatisms and postictal
dysfunction.
phenotype_term:
preferred_term: Focal-onset seizure
term:
id: HP:0007359
label: Focal-onset seizure
- name: Memory Impairment
category: Cognitive
frequency: FREQUENT
description: >-
Verbal memory impairment is especially prominent in left-sided disease and
is not fully explained by hippocampal subregion volume loss alone.
phenotype_term:
preferred_term: Memory impairment
term:
id: HP:0002354
label: Memory impairment
evidence:
- reference: PMID:29094314
reference_title: "Volumetric Changes in Hippocampal Subregions and Memory Performance in Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
The verbal memory of left TLE-HS patients was significantly impaired (P
< 0.001) and was not associated with the volumes of the left hippocampal
subregions.
explanation: >-
Directly supports memory impairment as a characteristic cognitive
phenotype in left MTLE-HS.
treatments:
- name: Anti-seizure Medication Pharmacotherapy
description: >-
Anti-seizure medications are the baseline pharmacologic treatment for MTLE-HS;
persistent seizures despite appropriate medication define the drug-resistant
population considered for resective or ablative interventions.
treatment_term:
preferred_term: anticonvulsant agent therapy
term:
id: MAXO:0000167
label: anticonvulsant agent therapy
evidence:
- reference: DOI:10.1111/epi.12220
reference_title: 'International consensus classification of hippocampal sclerosis in temporal lobe epilepsy: A Task Force report from the<scp>ILAE</scp>Commission on Diagnostic Methods'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Hippocampal sclerosis (HS) is the most frequent histopathology encountered in patients with drug‐resistant temporal lobe epilepsy (TLE).
explanation: >-
The consensus report frames hippocampal sclerosis in the drug-resistant
temporal-lobe epilepsy setting, supporting anti-seizure medication failure
as the treatment context before surgical escalation.
- reference: DOI:10.1001/jamaneurol.2025.1897
reference_title: Interstitial Thermal Therapy in Mesial Temporal Lobe Epilepsy
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: One-third of patients stopped or decreased their antiseizure medicines.
explanation: The MTLE LITT cohort documents antiseizure medicines as ongoing medical therapy around procedural treatment.
- name: Temporal Lobectomy for Drug-Resistant Disease
description: >-
In drug-resistant MTLE-HS, temporal lobectomy provides durable seizure
control for many patients and remains a key treatment strategy.
treatment_term:
preferred_term: surgical procedure
term:
id: MAXO:0000004
label: surgical procedure
evidence:
- reference: PMID:35547380
reference_title: "Long-Term Outcome of Temporal Lobe Epilepsy Surgery in 621 Patients With Hippocampal Sclerosis: Clinical and Surgical Prognostic Factors."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
We found that 73.6% of the patients were free from disabling seizures
(Engel Class I), maintained over time in 65% of patients followed up to
23 years after surgery.
explanation: >-
Supports temporal lobectomy as an effective long-term treatment for
drug-resistant TLE associated with hippocampal sclerosis.
- name: Laser Interstitial Thermal Therapy for Drug-Resistant MTLE
description: >-
Laser interstitial thermal therapy is a minimally invasive ablative option
for selected patients with drug-resistant mesial temporal lobe epilepsy,
including MTLE-HS, when the epileptogenic focus is anatomically targetable.
treatment_term:
preferred_term: surgical procedure
term:
id: MAXO:0000004
label: surgical procedure
evidence:
- reference: DOI:10.1001/jamaneurol.2025.1897
reference_title: Interstitial Thermal Therapy in Mesial Temporal Lobe Epilepsy
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: ImportanceLaser interstitial thermal therapy (LITT) is a surgical tool used to ablate epileptic foci and brain tumors.
explanation: This directly supports LITT as an ablative surgical tool for epileptic foci.
- reference: DOI:10.1001/jamaneurol.2025.1897
reference_title: Interstitial Thermal Therapy in Mesial Temporal Lobe Epilepsy
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: These findings indicate that LITT may be considered as a treatment option for drug-resistant MTLE.
explanation: The MTLE cohort study explicitly supports considering LITT for drug-resistant MTLE.
references:
- reference: DOI:10.1001/jamaneurol.2025.1897
title: Interstitial Thermal Therapy in Mesial Temporal Lobe Epilepsy
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: ImportanceLaser interstitial thermal therapy (LITT) is a surgical tool used to ablate epileptic foci and brain tumors.
supporting_text: ImportanceLaser interstitial thermal therapy (LITT) is a surgical tool used to ablate epileptic foci and brain tumors.
evidence:
- reference: DOI:10.1001/jamaneurol.2025.1897
reference_title: Interstitial Thermal Therapy in Mesial Temporal Lobe Epilepsy
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: ImportanceLaser interstitial thermal therapy (LITT) is a surgical tool used to ablate epileptic foci and brain tumors.
explanation: Deep research cited this publication as relevant literature for Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis.
- reference: DOI:10.1038/s41598-024-63541-7
title: Altered immune pathways in patients of temporal lobe epilepsy with and without hippocampal sclerosis
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: Over the past decades, the immune responses have been suspected of participating in the mechanisms for epilepsy.
supporting_text: Over the past decades, the immune responses have been suspected of participating in the mechanisms for epilepsy.
evidence:
- reference: DOI:10.1038/s41598-024-63541-7
reference_title: Altered immune pathways in patients of temporal lobe epilepsy with and without hippocampal sclerosis
supports: SUPPORT
evidence_source: COMPUTATIONAL
snippet: Over the past decades, the immune responses have been suspected of participating in the mechanisms for epilepsy.
explanation: Deep research cited this publication as relevant literature for Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis.
- reference: DOI:10.1093/brain/awt233
title: Epilepsy, hippocampal sclerosis and febrile seizures linked by common genetic variation around SCN1A
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: Epilepsy, hippocampal sclerosis and febrile seizures linked by common genetic variation around SCN1A
supporting_text: Epilepsy, hippocampal sclerosis and febrile seizures linked by common genetic variation around SCN1A
- reference: DOI:10.1111/epi.12220
title: 'International consensus classification of hippocampal sclerosis in temporal lobe epilepsy: A Task Force report from the<scp>ILAE</scp>Commission on Diagnostic Methods'
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: Hippocampal sclerosis (HS) is the most frequent histopathology encountered in patients with drug‐resistant temporal lobe epilepsy (TLE).
supporting_text: Hippocampal sclerosis (HS) is the most frequent histopathology encountered in patients with drug‐resistant temporal lobe epilepsy (TLE).
evidence:
- reference: DOI:10.1111/epi.12220
reference_title: 'International consensus classification of hippocampal sclerosis in temporal lobe epilepsy: A Task Force report from the<scp>ILAE</scp>Commission on Diagnostic Methods'
supports: SUPPORT
evidence_source: OTHER
snippet: Hippocampal sclerosis (HS) is the most frequent histopathology encountered in patients with drug‐resistant temporal lobe epilepsy (TLE).
explanation: Deep research cited this publication as relevant literature for Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis.
- reference: DOI:10.1111/epi.17979
title: 'Hippocampal sclerosis and temporal lobe epilepsy following febrile status epilepticus: The <scp>FEBSTAT</scp> study'
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: This study was undertaken to determine whether hippocampal T2 hyperintensity predicts sequelae of febrile status epilepticus, including hippocampal atrophy, sclerosis, and mesial temporal lobe epilepsy.
supporting_text: This study was undertaken to determine whether hippocampal T2 hyperintensity predicts sequelae of febrile status epilepticus, including hippocampal atrophy, sclerosis, and mesial temporal lobe epilepsy.
evidence:
- reference: DOI:10.1111/epi.17979
reference_title: 'Hippocampal sclerosis and temporal lobe epilepsy following febrile status epilepticus: The <scp>FEBSTAT</scp> study'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: This study was undertaken to determine whether hippocampal T2 hyperintensity predicts sequelae of febrile status epilepticus, including hippocampal atrophy, sclerosis, and mesial temporal lobe epilepsy.
explanation: Deep research cited this publication as relevant literature for Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis.
- reference: DOI:10.1111/epi.18676
title: 'The interacting etiologies of hippocampal sclerosis in epilepsy: A scoping review'
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: According to the International League Against Epilepsy classification, mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE‐HS) is considered an epilepsy syndrome.
supporting_text: According to the International League Against Epilepsy classification, mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE‐HS) is considered an epilepsy syndrome.
evidence:
- reference: DOI:10.1111/epi.18676
reference_title: 'The interacting etiologies of hippocampal sclerosis in epilepsy: A scoping review'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: According to the International League Against Epilepsy classification, mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE‐HS) is considered an epilepsy syndrome.
explanation: Deep research cited this publication as relevant literature for Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis.
- reference: DOI:10.1186/s40364-024-00636-3
title: Single-cell, single-nucleus and xenium-based spatial transcriptomics analyses reveal inflammatory activation and altered cell interactions in the hippocampus in mice with temporal lobe epilepsy
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: Temporal lobe epilepsy (TLE) is among the most common types of epilepsy and often leads to cognitive, emotional, and psychiatric issues due to the frequent seizures.
supporting_text: Temporal lobe epilepsy (TLE) is among the most common types of epilepsy and often leads to cognitive, emotional, and psychiatric issues due to the frequent seizures.
evidence:
- reference: DOI:10.1186/s40364-024-00636-3
reference_title: Single-cell, single-nucleus and xenium-based spatial transcriptomics analyses reveal inflammatory activation and altered cell interactions in the hippocampus in mice with temporal lobe epilepsy
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: Temporal lobe epilepsy (TLE) is among the most common types of epilepsy and often leads to cognitive, emotional, and psychiatric issues due to the frequent seizures.
explanation: Deep research cited this publication as relevant literature for Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis.
- reference: DOI:10.17879/freeneuropathology-2024-5269
title: 'Mesial temporal lobe epilepsy and hippocampal sclerosis associated with BRAFV600E mutant neurons in the Cornu Ammonis: an uncertain pathogenesis and a diagnostic challenge'
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: Mesial temporal lobe epilepsy (MTLE) is a common cause of seizures, and hippocampal sclerosis (HS) is the predominant subtype.
supporting_text: Mesial temporal lobe epilepsy (MTLE) is a common cause of seizures, and hippocampal sclerosis (HS) is the predominant subtype.
evidence:
- reference: DOI:10.17879/freeneuropathology-2024-5269
reference_title: 'Mesial temporal lobe epilepsy and hippocampal sclerosis associated with BRAFV600E mutant neurons in the Cornu Ammonis: an uncertain pathogenesis and a diagnostic challenge'
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: Mesial temporal lobe epilepsy (MTLE) is a common cause of seizures, and hippocampal sclerosis (HS) is the predominant subtype.
explanation: Deep research cited this publication as relevant literature for Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis.
- reference: DOI:10.3174/ajnr.a8214
title: Radiologic Classification of Hippocampal Sclerosis in Epilepsy
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: Radiologic Classification of Hippocampal Sclerosis in Epilepsy
supporting_text: Radiologic Classification of Hippocampal Sclerosis in Epilepsy
- reference: DOI:10.32388/zvebpt
title: Mesial temporal lobe epilepsy with hippocampal sclerosis
found_in:
- Mesial_Temporal_Lobe_Epilepsy_with_Hippocampal_Sclerosis-deep-research-falcon.md
findings:
- statement: Mesial temporal lobe epilepsy with hippocampal sclerosis
supporting_text: Mesial temporal lobe epilepsy with hippocampal sclerosis
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Mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE‑HS) is an International League Against Epilepsy (ILAE)–recognized epilepsy syndrome defined by focal seizures arising from mesial temporal (limbic) structures together with hippocampal sclerosis (HS), typically unilateral/asymmetric. HS is the most frequent histopathology in drug‑resistant temporal lobe epilepsy (TLE) and is strongly linked to favorable seizure outcomes after appropriately selected epilepsy surgery, while also being associated with substantial cognitive/psychiatric comorbidity and emerging molecular heterogeneity (immune activation; possible low‑level somatic mosaicism in rare cases). (ilae2020mesialtemporallobe pages 1-1, blumcke2013internationalconsensusclassification pages 1-2, blumcke2013internationalconsensusclassification pages 2-4)
| Topic | Key finding/statistics | Population/model | Publication (authors, journal) | Year/month | PMID | URL | Evidence context id |
|---|---|---|---|---|---|---|---|
| ILAE histopathologic HS classification | HS is the most common histopathology in drug-resistant TLE; in large surgical series HS identified in 33.6% of cases, with 5.1% dual pathology. ILAE Type 1 = severe CA1+CA4 neuronal loss/gliosis; Type 2 = CA1-predominant; Type 3 = CA4-predominant; Type 1 is most common (~60-80%) and linked to earlier precipitating injury and better postsurgical seizure control. Surgical seizure freedom after resection for drug-resistant TLE is ~60-80% at 2 years. | Human surgical pathology / clinicopathologic consensus | Blümcke et al., Epilepsia | 2013/Jul | not in text | https://doi.org/10.1111/epi.12220 | (blumcke2013internationalconsensusclassification pages 1-2, blumcke2013internationalconsensusclassification pages 2-4) |
| MTLE-HS syndrome definition | MTLE-HS described as a rare epilepsy syndrome with seizures arising from mesial temporal limbic structures (hippocampus, amygdala, parahippocampal gyrus) together with hippocampal sclerosis, commonly unilateral or asymmetric. Often associated with early-life precipitating events in first 5 years, latent seizure-free interval, typical auras/automatisms, later drug-refractoriness, and progressive memory/behavioral deficits. | Human expert consensus / syndrome definition | ILAE Commission on Neurosurgery of Epilepsy, Definitions | 2020/Feb | not in text | https://doi.org/10.32388/zvebpt | (ilae2020mesialtemporallobe pages 1-1) |
| MRI/radiologic HS classification aligned to ILAE subtypes | Conventional MRI signs: whole-hippocampal atrophy, increased T2 signal, loss of internal architecture. Proposed radiologic classification: Type 1 = severe subfield volume loss across all subfields or severe CA1+hilum loss; Type 2 = isolated/disproportionate CA1 loss; Type 3 = isolated/disproportionate hilar (CA4/dentate) loss; No HS = no subfield volume loss. Type 1 represents ~60-80% of surgical TLE, Type 2 ~5-10%, Type 3 ~4-7%. High-resolution coronal T2 TSE orthogonal to hippocampal axis is emphasized; T2-FLAIR not recommended as primary screening tool. | Human radiology-pathology review | Middlebrooks et al., American Journal of Neuroradiology | 2024/Feb | not in text | https://doi.org/10.3174/ajnr.a8214 | (middlebrooks2024radiologicclassificationof pages 1-3, middlebrooks2024radiologicclassificationof pages 5-7, middlebrooks2024radiologicclassificationof pages 7-9, middlebrooks2024radiologicclassificationof pages 9-10) |
| Febrile status epilepticus leading to HS/MTLE (FEBSTAT) | In a prospective cohort of 222 children after febrile status epilepticus, acute hippocampal T2 hyperintensity strongly predicted later HS and increased MTLE risk. Of 22 with acute T2 hyperintensity, 14 had follow-up and 10 developed definite HS persisting through 10 years. Overall, 44 developed epilepsy; 6 developed MTLE, of whom 2 had definite HS, 2 equivocal HS, and 2 no HS. Earlier FEBSTAT reporting noted ~10% incidence of hippocampal T2 hyperintensity after FSE progressing to radiologic HS at 1 year. | Human prospective pediatric cohort | Lewis et al., Epilepsia | 2024/Apr | not in text | https://doi.org/10.1111/epi.17979 | (lewis2024hippocampalsclerosisand pages 1-3, lewis2024hippocampalsclerosisand pages 3-5) |
| Immune pathways in TLE-HS | RNA-seq comparison of TLE-HS vs TLE-nonHS identified altered immune pathways and differential immune-related genes including HSP90AA1 and SOD1; proposed SOX2-OT/miR-671-5p/SPP1 axis as a potential therapeutic target. Notes HS as primary pathology in 36.4% of surgical TLE cases; cites glial activation and inflammatory cytokine production in TLE-HS. | Human hippocampal transcriptomics (3 TLE-HS vs 3 TLE-nonHS) | Che et al., Scientific Reports | 2024/Jun | not in text | https://doi.org/10.1038/s41598-024-63541-7 | (che2024alteredimmunepathways pages 1-2) |
| Single-cell and spatial transcriptomics mechanisms | KA-induced mouse TLE model showed inflammatory/stress pathway activation and suppression of axonal-development/neural-support pathways in hippocampus. Profiled 31,390 glial cells and 48,221 neuronal nuclei; Xenium panel mapped 247 genes. Key glial upregulated genes: Spp1, Trem2, Cd68; neuronal upregulated genes: Penk, Sorcs3, Plekha2. Supports activated glia as drivers of post-epileptogenic hippocampal remodeling. | Mouse kainic-acid TLE model; scRNA-seq/snRNA-seq/spatial transcriptomics | Liu et al., Biomarker Research | 2024/Sep | not in text | https://doi.org/10.1186/s40364-024-00636-3 | (liu2024singlecellsinglenucleusand pages 1-2) |
| Genetic susceptibility linking febrile seizures and MTLE-HS | GWAS/meta-analysis found genome-wide significant association for MTLE-HS with febrile seizures at the sodium channel gene cluster on 2q24.3: rs7587026 in SCN1A, P = 3.36 × 10^-9, OR 1.42 (95% CI 1.26-1.59). No association in a cohort with febrile seizures that did not later develop epilepsy, supporting syndrome-specific susceptibility. | Human GWAS/meta-analysis; 1018 cases + 7552 controls, replication 959 cases + 3591 controls | Kasperavičiūtė et al., Brain | 2013/Sep | not in text | https://doi.org/10.1093/brain/awt233 | (deleu2026theinteractingetiologies pages 6-7) |
| LITT real-world implementation (LAANTERN registry) | Prospective multicenter registry of 145 MTLE patients from 15 US level-IV centers: mean age 39.2 years; 50.3% female; median hospital stay 1 day; 96.6% discharged home. At 2 years, 58.4% (45/77) Engel I and 57.2% (44/77) ILAE 1/2. Adverse events in 16.5%, mostly mild/transient. One-third reduced or stopped ASMs; QOL improved at nearly all time points. | Human prospective multicenter registry | Landazuri et al., JAMA Neurology | 2025/Jul | not in text | https://doi.org/10.1001/jamaneurol.2025.1897 | (landazuri2025interstitialthermaltherapy pages 1-2) |
| Somatic/lesional molecular finding in MTLE-HS | Case report of 31-year-old man with MTLE and ILAE Type 1 HS containing rare BRAFV600E-immunopositive neurons (<1% of total cells) in Cornu Ammonis; sparse CD34+ cells; patient seizure-free for 2 years after surgery. Authors discuss possible somatic mosaicism/diagnostic challenge and suggest routine BRAFV600E testing in MTLE-HS research settings. | Human single case report / neuropathology | Alsalek et al., Free Neuropathology | 2024/Jan | not in text | https://doi.org/10.17879/freeneuropathology-2024-5269 | (alsalek2024mesialtemporallobe pages 1-3) |
Table: This table summarizes major authoritative and recent sources relevant to mesial temporal lobe epilepsy with hippocampal sclerosis, including consensus definitions, imaging/pathology classifications, mechanistic studies, and treatment outcomes. It highlights the main statistics and context IDs needed to support a disease knowledge base entry.
The ILAE Commission on Neurosurgery of Epilepsy describes MTLE‑HS as an epilepsy syndrome characterized by seizures arising from limbic structures of the mesial temporal lobe (hippocampus, amygdala, parahippocampal gyrus) together with hippocampal sclerosis, commonly unilateral or asymmetric; a frequent historical pattern includes an early-life precipitating event, a latent seizure‑free period, typical autonomic/experiential auras and automatisms, later drug refractoriness, and progressive memory/behavioral deficits. (ilae2020mesialtemporallobe pages 1-1)
The retrieved evidence set contains authoritative syndrome definitions and classification systems but does not include an explicit mapping to OMIM/Orphanet/ICD/MeSH/MONDO identifiers. Therefore, these identifiers cannot be reliably provided from the present corpus without adding dedicated ontology sources. (ilae2020mesialtemporallobe pages 1-1, blumcke2013internationalconsensusclassification pages 1-2)
Most disease-level definition/classification statements in this report come from ILAE consensus documents and radiology/pathology consensus reviews, while mechanistic statements come from a mix of human surgical tissue transcriptomics and animal-model single-cell/spatial transcriptomics. (ilae2020mesialtemporallobe pages 1-1, che2024alteredimmunepathways pages 1-2, liu2024singlecellsinglenucleusand pages 1-2)
MTLE‑HS is best supported as a multifactorial syndrome in which heterogeneous early insults and host susceptibility converge on hippocampal injury, network reorganization, and chronic seizure propensity. The ILAE HS pathology consensus highlights associations of HS severity with time-related factors and early insults, particularly prolonged febrile seizures. (blumcke2013internationalconsensusclassification pages 2-4, blumcke2013internationalconsensusclassification pages 1-2)
The FEBSTAT study provides high-quality prospective evidence linking FSE to later HS/MTLE via imaging biomarkers: acute hippocampal T2 hyperintensity shortly after FSE predicted later HS and increased MTLE risk. Among 22 with acute hippocampal T2 hyperintensity, 14 had follow-up and 10 developed definite HS persisting through 10-year follow-up; overall 44 developed epilepsy and 6 developed MTLE (with mixed HS status among those six). (Epilepsia; Apr 2024; https://doi.org/10.1111/epi.17979) (lewis2024hippocampalsclerosisand pages 1-3)
A key human GWAS result referenced in the evidence indicates common variation around SCN1A can increase susceptibility to MTLE‑HS in the setting of febrile seizures (reported odds ratio ~1.42). (deleu2026theinteractingetiologies pages 6-7)
A 2024 neuropathology case report describes a patient with MTLE and ILAE type 1 HS with a rare population of BRAFV600E‑immunopositive neurons (<1% of cells) and seizure freedom at 2 years post-surgery, emphasizing diagnostic complexity and raising the possibility of low-level somatic mosaicism in some MTLE‑HS cases. (Free Neuropathology; Jan 2024; https://doi.org/10.17879/freeneuropathology-2024-5269) (alsalek2024mesialtemporallobe pages 1-3)
Human hippocampal RNA-seq in a small cohort (3 TLE‑HS vs 3 TLE‑nonHS) reported altered immune-pathway signatures and identified immune-related genes (e.g., HSP90AA1, SOD1) and a proposed ceRNA axis (SOX2‑OT/miR‑671‑5p/SPP1) as potential therapeutic targets, supporting immune involvement in TLE‑HS. (Scientific Reports; Jun 2024; https://doi.org/10.1038/s41598-024-63541-7) (che2024alteredimmunepathways pages 1-2)
No protective genetic variants or environmental protective exposures were explicitly identified in the retrieved evidence corpus.
The convergent picture supported by the retrieved evidence is that early-life insults (e.g., FSE with acute hippocampal injury) can interact with host susceptibility (e.g., common SCN1A-region variation; rare somatic variants in selected reports) to influence whether HS develops and how MTLE manifests. (lewis2024hippocampalsclerosisand pages 1-3, deleu2026theinteractingetiologies pages 6-7, alsalek2024mesialtemporallobe pages 1-3)
The ILAE syndrome definition describes typical MTLE‑HS seizures as limbic-onset seizures with features such as rising epigastric aura; emotional disturbances and illusions; autonomic signs (e.g., palpitations); progressive impairment of awareness; oroalimentary automatisms (lip smacking/chewing/licking); behavioral arrest; head deviation; dystonic postures; and manual/verbal automatisms, followed by postictal dysfunction. (ilae2020mesialtemporallobe pages 1-1)
The ILAE definition notes a common course with early medication responsiveness followed by later drug refractoriness and progressive memory/behavioral deficits. (ilae2020mesialtemporallobe pages 1-1)
In outpatient TLE series, MRI evidence of hippocampal atrophy was reported in ~25% of TLE patients, rising to ~70% in tertiary presurgical cohorts, illustrating ascertainment differences between general and surgical populations. (blumcke2013internationalconsensusclassification pages 1-2)
Because HPO identifiers are not embedded in the retrieved texts, the following are suggested mappings consistent with the described clinical features: * Focal seizures with impaired awareness; focal autonomic seizures; epigastric aura; automatisms; dystonia; postictal confusion. (ilae2020mesialtemporallobe pages 1-1) * Memory impairment / declarative memory impairment (especially linked to HS subtype discussions). (middlebrooks2024radiologicclassificationof pages 10-11)
(These are suggestions; exact HPO IDs should be validated against the HPO database.)
MTLE‑HS is not presented in the retrieved corpus as a single-gene Mendelian disorder; rather, it is supported as a syndrome with polygenic susceptibility and heterogeneous upstream causes. (ilae2020mesialtemporallobe pages 1-1, deleu2026theinteractingetiologies pages 6-7)
Common variation around SCN1A is reported (in the retrieved evidence) as increasing susceptibility to MTLE‑HS when febrile seizures are part of the clinical history, consistent with an excitability–insult interaction model. (deleu2026theinteractingetiologies pages 6-7)
A 2024 case report provides direct evidence of BRAFV600E‑positive neurons within a hippocampus showing ILAE type 1 HS, consistent with a hypothesis that rare somatic mosaicism may contribute in selected cases. (alsalek2024mesialtemporallobe pages 1-3)
Human RNA-seq study reported immune-related differential genes (e.g., HSP90AA1, SOD1) and a candidate regulatory axis SOX2‑OT/miR‑671‑5p/SPP1. (che2024alteredimmunepathways pages 1-2)
Not explicitly reported in the retrieved evidence corpus.
The ILAE syndrome definition and HS classification literature emphasizes early-life precipitating events (including febrile seizures, hypoxia, intracranial infection, and head trauma) as commonly reported antecedents; however, the retrieved corpus does not quantify environmental exposures beyond the febrile status epilepticus imaging-risk relationship described in FEBSTAT. (ilae2020mesialtemporallobe pages 1-1, lewis2024hippocampalsclerosisand pages 1-3)
The ILAE 2013 consensus defines HS as segmental pyramidal cell loss of Ammon’s horn with reactive astrogliosis, and standardizes three HS types (ILAE types 1–3) based on subfield neuronal loss and gliosis patterns. Type 1 (severe CA1+CA4) is most common and is associated with early precipitating injuries and favorable postsurgical seizure control. (Epilepsia; Jul 2013; https://doi.org/10.1111/epi.12220) (blumcke2013internationalconsensusclassification pages 2-4, blumcke2013internationalconsensusclassification pages 1-2)
Visual evidence: the ILAE HS subtype patterns and semiquantitative scoring are shown in the extracted Table/Figure images. (blumcke2013internationalconsensusclassification media 00cbc9f7, blumcke2013internationalconsensusclassification media 925dc1e6)
Human transcriptomic findings support immune activation in TLE‑HS, including signals consistent with glial activation and immune-pathway enrichment, and propose immune regulatory axes as candidate therapeutic targets. (che2024alteredimmunepathways pages 1-2)
In an established animal model, single-cell/single-nucleus and spatial transcriptomics after intrahippocampal kainic acid identified broad inflammatory/stress pathway activation across hippocampal cell types, with upregulation of glial markers such as Spp1, Trem2, Cd68, supporting a mechanistic chain where seizures/injury provoke glial activation that may contribute to hippocampal remodeling and epileptogenesis. (Biomarker Research; Sep 2024; https://doi.org/10.1186/s40364-024-00636-3) (liu2024singlecellsinglenucleusand pages 1-2)
One evidence-supported causal chain is: febrile status epilepticus → acute hippocampal injury (T2 hyperintensity) → later hippocampal sclerosis → increased long-term risk of epilepsy/MTLE. This is directly supported by FEBSTAT’s prospective imaging-to-outcome association. (lewis2024hippocampalsclerosisand pages 1-3, lewis2024hippocampalsclerosisand pages 3-5)
Primary system: central nervous system, specifically the mesial temporal lobe limbic network including hippocampus, amygdala, and parahippocampal gyrus. (ilae2020mesialtemporallobe pages 1-1)
HS is characterized by selective neuronal loss in hippocampal subfields with reactive astrogliosis; subtype patterns emphasize CA1 vs CA4/dentate involvement. (blumcke2013internationalconsensusclassification pages 2-4, middlebrooks2024radiologicclassificationof pages 5-7)
MTLE‑HS is commonly unilateral or asymmetric. (ilae2020mesialtemporallobe pages 1-1)
The ILAE definition notes frequent association with an early-life precipitating event (often within the first five years) followed by a latent seizure-free period prior to chronic epilepsy. (ilae2020mesialtemporallobe pages 1-1)
The ILAE definition describes a tendency toward later drug refractoriness and progressive behavioral/memory deficits. (ilae2020mesialtemporallobe pages 1-1)
The retrieved evidence corpus does not provide population prevalence/incidence for MTLE‑HS. However, it provides surgical-series frequency and cohort-selection markers: HS was identified in 33.6% of cases in large epilepsy surgery series, and MRI evidence of hippocampal atrophy is reported in ~25% of outpatient TLE series vs ~70% of tertiary presurgical cohorts. (blumcke2013internationalconsensusclassification pages 1-2)
The evidence supports MTLE‑HS as typically multifactorial / complex, with common-variant susceptibility (e.g., SCN1A-region association in the context of febrile seizures) and rare somatic mosaic findings in selected reports rather than a single Mendelian inheritance pattern. (deleu2026theinteractingetiologies pages 6-7, alsalek2024mesialtemporallobe pages 1-3)
Diagnosis relies on establishing limbic/mesial temporal seizure onset and evidence of HS, integrating clinical semiology with neurophysiology and neuroimaging, per ILAE syndrome definition. (ilae2020mesialtemporallobe pages 1-1)
A 2024 AJNR review emphasizes that “binary” MRI assessment (HS yes/no) misses subfield-predominant HS (types 2/3), and proposes an MRI radiologic classification aligned with the ILAE pathology types. Conventional MRI hallmarks include hippocampal atrophy, increased T2 signal, and loss of internal architecture. (AJNR; Feb 2024; https://doi.org/10.3174/ajnr.a8214) (middlebrooks2024radiologicclassificationof pages 1-3)
Key 2024 implementation detail: high-resolution oblique coronal T2 turbo spin echo orthogonal to the hippocampal long axis is emphasized; the paper states T2‑FLAIR is not recommended as the primary screening sequence. (middlebrooks2024radiologicclassificationof pages 7-9)
Radiologic subtype mapping (MRI vs ILAE pathology): * Type 1 (classic): severe volume loss across all subfields (or severe CA1 + hilum loss with CA2/CA3 sparing). (middlebrooks2024radiologicclassificationof pages 7-9) * Type 2: CA1‑predominant disproportionate loss with loss of normal CA1 tapering. (middlebrooks2024radiologicclassificationof pages 5-7, middlebrooks2024radiologicclassificationof pages 9-10) * Type 3: hilar (CA4/dentate gyrus)‑predominant disproportionate loss with CA1–CA3 preserved. (middlebrooks2024radiologicclassificationof pages 5-7) * No HS: no subfield volume loss. (middlebrooks2024radiologicclassificationof pages 7-9)
The ILAE HS classification provides a semiquantitative scoring approach using neuronal and gliosis markers (e.g., NeuN, GFAP) and standardized CA subfield assessment to assign HS type 1–3 or no-HS category. (blumcke2013internationalconsensusclassification pages 2-4, blumcke2013internationalconsensusclassification pages 1-2)
Not systematically addressed in the retrieved evidence corpus; however, the ILAE HS consensus notes that HS-like changes may occur in elderly non-epileptic brains after anoxic/ischemic injury, underscoring the need for clinicopathologic correlation. (blumcke2013internationalconsensusclassification pages 2-4)
The ILAE HS pathology consensus reports that surgical resection for drug-resistant TLE is associated with postoperative seizure freedom in ~60–80% at 2 years (in appropriately selected patients), with variation by HS subtype (type 1 generally more favorable). (blumcke2013internationalconsensusclassification pages 2-4, blumcke2013internationalconsensusclassification pages 1-2)
A prospective US multicenter registry (LAANTERN) reported 2‑year seizure outcomes after LITT for drug-resistant MTLE: 58.4% Engel class I (45/77) and 57.2% ILAE class 1/2 (44/77) at 2 years among those with 2‑year follow-up; adverse events occurred in 16.5% (mostly mild/transient), and QOL scores improved at almost all time points. (JAMA Neurology; Jul 2025; https://doi.org/10.1001/jamaneurol.2025.1897) (landazuri2025interstitialthermaltherapy pages 1-2)
The retrieved corpus provides syndrome-level statements that MTLE‑HS often becomes drug‑refractory over time, but does not specify comparative antiseizure medication regimens. (ilae2020mesialtemporallobe pages 1-1)
Resective surgery (e.g., anterior temporal lobectomy / mesial temporal resection) is established as a key treatment for drug-resistant MTLE‑HS, with reported seizure-freedom rates in the 60–80% range at ~2 years in consensus sources. (blumcke2013internationalconsensusclassification pages 2-4)
Laser interstitial thermal therapy (LITT) is increasingly implemented in specialized epilepsy centers; prospective registry outcomes indicate clinically meaningful seizure control with short hospital stays (median 1 day) and generally mild/transient adverse events. (landazuri2025interstitialthermaltherapy pages 1-2)
The retrieved trial records indicate several ongoing or completed interventional studies targeting MTLE (including MTLE‑HS).
SEEG-guided RF thermocoagulation vs anterior temporal lobectomy (ATL) in mTLE with HS – NCT03941613 (Xuanwu Hospital, Beijing). Randomized, parallel, double-masked trial; primary outcome cognitive function at 1 year; secondary outcomes include Engel seizure outcome at 1 year, QOL, complications; enrollment 40; completed 2023‑01‑05. (ClinicalTrials.gov) (NCT03941613 chunk 1)
AMT‑260 gene therapy – NCT06063850 (UniQure; Phase 1/2a; recruiting). One-time intracerebral AAV9 gene therapy (AAV9‑hSyn1‑miGRIK2) via MRI‑guided convection-enhanced delivery; targets GRIK2 (GluK2 kainate receptor) via miRNA silencing; primary outcome adverse events over 1 year; enrollment 12; adults 18–75 with unilateral refractory MTLE and unilateral hippocampal pathology. (ClinicalTrials.gov) (NCT06063850 chunk 1)
NRTX‑1001 cell therapy – NCT05135091 (Neurona Therapeutics; recruiting). Intracerebral administration of allogeneic human embryonic stem cell–derived GABAergic inhibitory interneurons; Phase 1/2 with subsequent Phase 3 sham-controlled randomized component; safety endpoints include serious/severe adverse events over 1 year and seizure-frequency change endpoints. (ClinicalTrials.gov) (NCT05135091 chunk 1)
Evidence in the retrieved corpus supports secondary prevention / risk stratification concepts after febrile status epilepticus via early MRI biomarkers: FEBSTAT indicates that acute hippocampal T2 hyperintensity identifies a subgroup at higher risk for later HS and MTLE, suggesting a practical framework for closer monitoring and potential future preventive trials. (lewis2024hippocampalsclerosisand pages 1-3)
No established primary prevention interventions were identified in the retrieved evidence corpus.
No naturally occurring MTLE‑HS analogs in other species were explicitly documented in the retrieved evidence corpus.
A 2024 mechanistic study used a mouse intrahippocampal kainic-acid model to induce TLE and performed scRNA‑seq, snRNA‑seq, and spatial transcriptomics, generating a hippocampal atlas of glial and neuronal transcriptomic changes supporting inflammatory activation and altered cell interactions as candidate mechanisms relevant to HS development and epileptogenesis. (liu2024singlecellsinglenucleusand pages 1-2)
Suggested model categories for MTLE‑HS (supported by retrieved evidence): * Chemoconvulsant/lesion-based models: kainic acid intrahippocampal model. (liu2024singlecellsinglenucleusand pages 1-2)
References
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(blumcke2013internationalconsensusclassification media 00cbc9f7): Ingmar Blümcke, Maria Thom, Eleonora Aronica, Dawna D. Armstrong, Fabrice Bartolomei, Andrea Bernasconi, Neda Bernasconi, Christian G. Bien, Fernando Cendes, Roland Coras, J. Helen Cross, Thomas S. Jacques, Philippe Kahane, Gary W. Mathern, Haijme Miyata, Solomon L. Moshé, Buge Oz, Çiğdem Özkara, Emilio Perucca, Sanjay Sisodiya, Samuel Wiebe, and Roberto Spreafico. International consensus classification of hippocampal sclerosis in temporal lobe epilepsy: a task force report from the ilae commission on diagnostic methods. Epilepsia, 54:1315-1329, Jul 2013. URL: https://doi.org/10.1111/epi.12220, doi:10.1111/epi.12220. This article has 1269 citations and is from a domain leading peer-reviewed journal.
(blumcke2013internationalconsensusclassification media 925dc1e6): Ingmar Blümcke, Maria Thom, Eleonora Aronica, Dawna D. Armstrong, Fabrice Bartolomei, Andrea Bernasconi, Neda Bernasconi, Christian G. Bien, Fernando Cendes, Roland Coras, J. Helen Cross, Thomas S. Jacques, Philippe Kahane, Gary W. Mathern, Haijme Miyata, Solomon L. Moshé, Buge Oz, Çiğdem Özkara, Emilio Perucca, Sanjay Sisodiya, Samuel Wiebe, and Roberto Spreafico. International consensus classification of hippocampal sclerosis in temporal lobe epilepsy: a task force report from the ilae commission on diagnostic methods. Epilepsia, 54:1315-1329, Jul 2013. URL: https://doi.org/10.1111/epi.12220, doi:10.1111/epi.12220. This article has 1269 citations and is from a domain leading peer-reviewed journal.
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