Abstract
Gliomas typically grow along white matter fiber tracts, yet their invasion patterns remain unclear. This study assessed the effect of insular glioma on large white matter fiber tracts and the microstructural subcortical changes associated with clinical outcomes in patients with insular glioma. Twenty-five patients with insular glioma were enrolled and divided into left and right groups according to tumor lateralization. The control group comprised 14 healthy volunteers. Subjects in both the glioma and control groups underwent diffusion tensor magnetic resonance imaging at 3.0 T. The characteristics of white matter fiber bundles were analyzed using tract-based spatial statistics and automatic fiber quantification. Both Automatic Fiber Quantification and Tract-Based Spatial Statistics revealed that patients with insular glioma had significantly lower fractional anisotropy (FA) values in the inferior frontal-occipital fasciculus and uncinate fasciculus ipsilateral to the tumor, than the controls. Fractional anisotropy associated with mean diffusivity values several large fiber tracts showed potential on tumor-grade distinguishing. Diffusion metrics can sensitively detect microstructural changes in tumor progression. Insular glioma significantly affects the microstructure of white matter fibers proximal to the tumor. The range of white matter fiber bundles affected differs according to the grade of the glioma. These changes are mainly associated with early-stage tumor invasion.
Highlights
Gliomas typically grow along white matter fiber tracts, yet their invasion patterns remain unclear
Latini et al.[15] demonstrated a link between Diffusion tensor imaging (DTI) metrics and early infiltration identified by pathology
There were no significant differences in the fractional anisotropy (FA) or Radial Diffusivity (RD)
Summary
Gliomas typically grow along white matter fiber tracts, yet their invasion patterns remain unclear. This study assessed the effect of insular glioma on large white matter fiber tracts and the microstructural subcortical changes associated with clinical outcomes in patients with insular glioma. The characteristics of white matter fiber bundles were analyzed using tract-based spatial statistics and automatic fiber quantification Both Automatic Fiber Quantification and Tract-Based Spatial Statistics revealed that patients with insular glioma had significantly lower fractional anisotropy (FA) values in the inferior frontal-occipital fasciculus and uncinate fasciculus ipsilateral to the tumor, than the controls. Fractional anisotropy associated with mean diffusivity values several large fiber tracts showed potential on tumor-grade distinguishing. The range of white matter fiber bundles affected differs according to the grade of the glioma These changes are mainly associated with early-stage tumor invasion. A macroscale DTI-based glioma study found significant glioma-related changes in many white matter regions in several DTI coefficients, which were sensitive in early-stage tumor progression[12–14]. DTI is a highly sensitive and non-invasive technique to study neuroplasticity of the macroscopic brain connections in vivo[17–20]
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