Segmental Diffusion Properties of the Corticospinal Tract and Motor Outcome in Hemiparetic Children With Perinatal...

Area of Science:

• Neuroimaging
• Pediatric Neurology
• Developmental Neuroscience

Background:

• Perinatal stroke impacts developing motor systems, leading to hemiparetic cerebral palsy.
• Understanding structural connectivity is crucial for assessing motor deficits.

Purpose of the Study:

• To assess corticospinal tract diffusion using diffusion tensor imaging (DTI) in children with perinatal stroke.
• To correlate DTI findings with long-term motor outcomes.

Main Methods:

• Diffusion tensor imaging (DTI) was performed on 28 children (6-18 years) with unilateral perinatal stroke.
• Corticospinal tracts were segmented into full tract, partial tract, minitract, and region of interest.
• Diffusion characteristics (fractional anisotropy, mean, axial, and radial diffusivity) were calculated and compared between lesioned and nonlesioned hemispheres.

Main Results:

• Fractional anisotropy and radial diffusivity ratios decreased with decreasing tract size.
• Mean diffusivity showed consistent symmetry between hemispheres.
• Lower fractional anisotropy correlated with poor motor outcomes across all segments.
• Radial diffusivity correlated with Assisting Hand Assessment and Melbourne Assessment scores.

Conclusions:

• Diffusion imaging of segmented corticospinal tracts is feasible in hemiparetic children post-perinatal stroke.
• The correlation between diffusion characteristics and motor outcomes highlights clinical relevance.
• These findings support the utility of DTI in developing personalized rehabilitation models.