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Updated: May 6, 2026
Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
Published on: August 5, 2014
Change in Structural Connectivity Following Stereotactic Thermocoagulation in Mesial Temporal Lobe Epilepsy Patients
Stéphane Jean1, Rifeng Jiang2, Yihai Dai3
1Pediatric Epilepsy Center, Fujian Medical University Fuzhou Children's Hospital, Fuzhou, China.
Aims:
To examine the association between postoperative lesions in distinct ROIs of the brain and the impact that their ablation would have on the structural and functional brain connectivity relative to outcomes.
Methods:
We retrospectively reviewed 21 patients with refractory unilateral MTLE. The percentage of each ablated gray matter region of interest (ROIs) was calculated, using a voxel-by-voxel comparison. The percentage of the affected fibers was calculated by assessing the neuronal change reflected by a decrease in anisotropy in the repeat scans (i.e., pre and postoperative). Graph theory analysis was used to investigate the change in the pre and postoperative structural and functional networks between the seizure-free and non-seizure-free groups.
Results:
Fifteen patients (71.42%) were seizure-free and six (28.57%) were non-seizure-free at a 12 to 48 months (23.80 ± 8.93) follow-up. Four patients (19.04%) reported memory decline following RFTC. The seizure-free group showed a larger ablation volume of both the amygdala (p = 0.024) and rhinal cortex (p = 0.035), and an alteration in structural connectivity networks metrics (p < 0.05) compared to the non-seizure-free group.
Conclusions:
Our study shows that a higher ablation of both the amygdala and rhinal cortex led to improved structural connectivity and was associated with better outcomes. Our results provide insight into some essential elements of brain connectivity networks in MTLE and might contribute to the generation of novel evidence that could improve SEEG-guided RFTC interventions in MTLE patients.
Insights
Greater ablation of the amygdala and rhinal cortex in epilepsy surgery improves brain connectivity and seizure control. This study highlights the importance of these regions for surgical outcomes in medically intractable epilepsy.
Area of Science:
- Neurosurgery
- Epileptology
- Neuroscience
Background:
- Medically intractable temporal lobe epilepsy (MTLE) often requires surgical intervention.
- Understanding the relationship between resected brain regions, network alterations, and patient outcomes is crucial for optimizing surgical strategies.
Purpose of the Study:
- To investigate the association between the extent of postoperative lesions in specific brain regions and their impact on structural and functional brain connectivity.
- To correlate these network changes with patient outcomes following surgery for refractory MTLE.
Main Methods:
- Retrospective analysis of 21 patients with refractory unilateral MTLE undergoing surgery.
- Voxel-by-voxel calculation of ablated gray matter and affected fiber pathways (decrease in anisotropy).
- Graph theory analysis to compare pre- and postoperative structural and functional brain networks between seizure-free and non-seizure-free groups.
Main Results:
- Fifteen patients (71.42%) achieved seizure freedom at follow-up (12-48 months).
- The seizure-free group demonstrated significantly larger ablation volumes in the amygdala and rhinal cortex.
- Significant alterations in structural connectivity network metrics were observed in the seizure-free group compared to the non-seizure-free group.
Conclusions:
- Higher ablation volumes of the amygdala and rhinal cortex are associated with improved structural connectivity and better seizure control in MTLE.
- These findings offer insights into the role of brain connectivity networks in MTLE and may inform the development of improved SEEG-guided RFTC interventions.
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