Diffusion Tensor Imaging Shows Corpus Callosum Differences between High-Grade Gliomas and Metastases.

Area of Science:

• Neuroimaging
• Neuro-oncology
• Brain anatomy

Background:

• The corpus callosum (CC) is vital for interhemispheric communication.
• Brain tumors can influence CC structure and function, impacting brain reorganization.
• Diffusion tensor imaging (DTI) reveals microstructural changes in the CC.

Purpose of the Study:

• To investigate structural differences in the CC between high-grade gliomas (HGGs) and metastatic tumors (METs).
• To utilize DTI metrics—fractional anisotropy (FA), mean diffusivity (MD), and axial diffusivity (AD)—to differentiate between HGG and MET tumor types.
• To assess the relationship between tumor/CC volume and contralateral brain reorganization.

Main Methods:

• Retrospective study of 30 HGG and 20 MET patients with MRI and DTI scans.
• Segmentation of tumors and CC to determine volumes.
• Region of interest analysis of the CC body on DTI parametric maps to obtain averaged FA, MD, and AD values.

Main Results:

• Significant differences in FA and MD values were observed between HGG and MET groups.
• HGG patients exhibited higher FA and lower MD compared to MET patients.
• No correlation was found between DTI parameters and tumor or CC anatomical volumes.

Conclusions:

• HGG patients demonstrate more contralateral brain reorganization than MET patients.
• Tumor volume and CC volume do not appear to influence the extent of contralateral brain reorganization.
• DTI characteristics of the CC can help distinguish between HGG and MET, reflecting differing reorganization patterns.