Voxel-based mapping of postoperative epilepsy risk in glioma patients: supplementary motor area and limbic system correlations.

Objective: This study aims to explore the correlation between glioma location in the limbic system and the risk of secondary epilepsy. Methods: This retrospective study included 170 cases of lower-grade gliomas treated with initial surgery from July 2007 to July 2019, sourced from the Chinese Glioma Genome Atlas (CGGA) database (http://www.cgga.org.cn). Patients were categorized into epilepsy and non-epilepsy groups based on postoperative symptoms. Imaging data were obtained from the Imaging Center of Beijing Tiantan Hospital, and postoperative epilepsy episodes were collected through follow-up. T2-weighted (T2WI) DICOM raw image data were converted into NII images, and tumor-susceptible regions were delineated using MRIcro software. Standardized T2WI gliomas and regions of interest (ROI) were analyzed using voxel-based lesion-symptom mapping (VLSM) software (https://crl.ucsd.edu/?). Overlapping ROIs were mapped for each patient. For voxel analysis in epilepsy-susceptible regions, the voxel with the highest Results: Voxels significantly associated with tumor-related epilepsy were primarily located in the medial frontal lobe's supplementary motor area of the left hemisphere. The peak voxel at this location was Conclusion: Epilepsy-susceptible regions of tumor-related epilepsy are located in the supplementary motor area of the medial frontal lobe in the left hemisphere. Regions not susceptible to epilepsy could primarily be in the anterior upper cingulate gyrus. Gliomas involving the anterior cingulate gyrus in the limbic system are associated with a lower postoperative risk of tumor-related epilepsy.