Quantitative fetal MRI with diffusion tensor imaging in cases with 'short' corpus callosum

Area of Science:

• Neuroimaging
• Fetal Development
• Diffusion Tensor Imaging (DTI)

Background:

• Short Corpus Callosum (SCC) can be challenging to differentiate from normal development variants.
• Probst Bundles (PB) presence may indicate corpus callosal (CC) dysplasia.
• Diffusion Tensor Imaging (DTI) offers quantitative metrics for white matter microstructure analysis.

Purpose of the Study:

• To compare DTI parameters between fetuses with SCC and normal CC.
• To differentiate SCC with PB (SCC-PB+) from SCC without PB (SCC-PB-) using DTI.
• To assess if isolated SCC-PB- represents a normal CC variant.

Main Methods:

• Retrospective analysis of fetal MRI and DTI data from 22 SCC cases and 66 controls.
• Quantitative DTI parameters (FA and ADC) measured in the entire CC and its regions.
• Statistical comparison using ANOVA and ANCOVA, adjusted for confounders.

Main Results:

• SCC cases exhibited significantly smaller CC dimensions than normal controls.
• SCC-PB+ cases showed significantly lower FA and higher ADC values compared to SCC-PB- and normal CC cases.
• SCC-PB- cases did not show significant differences in FA and ADC compared to normal CC cases.

Conclusions:

• Fetal DTI can identify white matter microstructure alterations in SCC-PB+ cases.
• Isolated SCC-PB- cases demonstrate normal DTI parameters, suggesting a variant of normal development.
• DTI parameters are valuable in distinguishing between CC dysplasia and normal variants in SCC.