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Updated: May 10, 2026
Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study
Published on: August 15, 2025
Evaluation of corpus callosum morphometry in patients with mesial temporal lobe epilepsy with hippocampal sclerosis
A Firat1, A B Tascioglu, M D Demiryurek
1Department of Anatomy, Faculty of Medicine, Hacettepe University, Sihhiye, Ankara, 06100, Turkey, aysfirat@hacettepe.edu.tr.
Purpose:
The purpose of the study was to evaluate the effects of mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS) on corpus callosum (CC) morphometry in large and pathologically proven MTLE-HS patients.
Methods:
We measured certain CC dimensions in 103 patients and 33 healthy controls using in vivo magnetic resonance imaging. In particular, we compared the two groups in relation to the clinical (localization of the HS, duration of epilepsy, frequency of seizures and length of seizures) and demographical (age, gender, handedness) features. Students' t test, two-way ANOVA and Spearman test were used for statistical analysis.
Results:
There was no significant difference between CC morphometry with respect to age and handedness among patients. The differences between the genders, however, were significant favouring longer diameters in males. We found significant decrease in the dimensions of the genu, body, isthmus and splenium of the CC in the MTLE-HS group, but there was no reduction in the size of the rostrum.
Conclusions:
This general reduction in the size of the CC except for the rostrum was thought to be the result of cortical atrophy secondary to the disease. Concerning the preserved rostral part of the CC, it was thought that the fibers of the frontal lobe pass through different pathways than the tracts in the rostrum.
Insights
Mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS) causes significant corpus callosum (CC) size reduction, except for the rostrum. This CC atrophy may result from secondary cortical damage in MTLE-HS patients.
Area of Science:
- Neuroimaging
- Epilepsy Research
- Neuroanatomy
Background:
- Mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS) is a common epilepsy syndrome.
- The corpus callosum (CC) is the largest white matter tract connecting the two cerebral hemispheres.
- Understanding CC morphometry in MTLE-HS is crucial for comprehending epilepsy-related brain changes.
Purpose of the Study:
- To investigate the impact of MTLE-HS on the morphometry of the corpus callosum.
- To compare CC dimensions between patients with MTLE-HS and healthy controls.
- To explore correlations between CC morphometry and clinical/demographic factors in MTLE-HS.
Main Methods:
- In vivo magnetic resonance imaging (MRI) was used to measure CC dimensions in 103 MTLE-HS patients and 33 controls.
- Statistical analyses included Student's t-test, two-way ANOVA, and Spearman test.
- Clinical data (HS localization, epilepsy duration, seizure frequency/length) and demographics (age, gender, handedness) were analyzed.
Main Results:
- No significant differences in CC morphometry were found concerning age and handedness.
- Gender differences were significant, with males exhibiting larger CC diameters.
- A significant reduction in the dimensions of the genu, body, isthmus, and splenium of the CC was observed in MTLE-HS patients, while the rostrum remained unaffected.
Conclusions:
- MTLE-HS is associated with a generalized reduction in CC size, excluding the rostrum.
- This CC atrophy is likely secondary to cortical damage caused by the epilepsy.
- The preserved rostrum suggests distinct pathways for frontal lobe fibers compared to other CC tracts.
