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The morphological characteristics of hippocampus and thalamus in mesial temporal lobe epilepsy
Dongyan Wu1, Feiyan Chang2, Dantao Peng3
1Department of Neurology, China-Japan Friendship Hospital, Beijing, 100029, China. wudongyan2008@sina.com.
Background:
Mesial temporal lobe epilepsy (MTLE) is the most common form of focal epilepsy, which is frequently characterized by hippocampal sclerosis (HS). Accumulating studies have suggested widespread cortico-cortical connections related to MTLE. The role of subcortical structures involved in general epilepsy has been extensively investigated, but it is still limited in MTLE. Our purpose was to determine the specific morphological correlation between sclerotic hippocampal and thalamic sub-regions, using quantitative analysis, in MTLE.
Methods:
In this study, 23 MTLE patients with unilateral hippocampal sclerosis and 24 healthy controls were examined with three-dimensional T1 MRI. Volume quantitative analysis in the hippocampus and thalamus was conducted and group-related volumetric difference was assessed. Moreover, vertex analysis was further performed using automated software to delineate detailed morphological patterns of the hippocampus and thalamus. The correlation was used to examine whether there is a relationship between volume changes of two subcortical structures and clinical characteristics.
Results:
The patients had a significant volume decrease in the sclerotic hippocampus (p < 0.001). Compared to controls, obvious atrophic patterns were observed in the bilateral hippocampus in MTLE (p < 0.05). Only small patches of shrinkage were noted in the bilateral thalamus (p < 0.05). Moreover, the volume change of the hippocampus had a significant positive correlation with that of the thalamus (P < 0.001). Intriguingly, volume changes of the hippocampus and thalamus were correlated with the duration of epilepsy (hippocampus: P = 0.024; thalamus: P = 0.022). However, only volume changes of thalamus possibly differentiated between two prognostic groups in patients (P = 0.026).
Conclusions:
We demonstrated the morphological characteristics of the hippocampus and thalamus in MTLE, providing new insights into the interrelated mechanisms between the hippocampus and thalamus, which have potential clinical significance for refining neuromodulated targets.
Insights
Mesial temporal lobe epilepsy (MTLE) with hippocampal sclerosis shows significant hippocampal and thalamic volume loss. These changes correlate with epilepsy duration and may help predict patient prognosis, offering insights for treatment targets.
Area of Science:
- Neuroscience
- Radiology
- Epileptology
Background:
- Mesial temporal lobe epilepsy (MTLE) is the most common focal epilepsy, often linked to hippocampal sclerosis (HS).
- While cortico-cortical connections in MTLE are studied, subcortical structure involvement, particularly the thalamus, remains less understood.
- Investigating the hippocampus-thalamus relationship in MTLE is crucial for understanding epilepsy pathophysiology.
Purpose of the Study:
- To quantitatively analyze the morphological correlation between sclerotic hippocampi and thalamic sub-regions in MTLE patients.
- To explore the relationship between volume changes in the hippocampus and thalamus and clinical characteristics of MTLE.
Main Methods:
- Utilized 3D T1 MRI scans from 23 MTLE patients with unilateral HS and 24 healthy controls.
- Performed quantitative volume analysis of the hippocampus and thalamus, assessing group differences and detailed morphological patterns via vertex analysis.
- Examined correlations between subcortical volume changes and epilepsy duration and prognosis.
Main Results:
- MTLE patients exhibited significant hippocampal volume reduction (p < 0.001) and atrophic patterns in the bilateral hippocampus (p < 0.05).
- The bilateral thalamus showed minor shrinkage (p < 0.05).
- A significant positive correlation was found between hippocampal and thalamic volume changes (P < 0.001), both correlating with epilepsy duration. Thalamic volume changes potentially differentiated prognostic groups (P = 0.026).
Conclusions:
- Demonstrated distinct morphological characteristics of the hippocampus and thalamus in MTLE.
- Provided new insights into the interconnected mechanisms between the hippocampus and thalamus in MTLE.
- Highlighted the potential clinical significance of these findings for refining neuromodulation targets in epilepsy treatment.
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