Diffuse changes in cortical thickness in pediatric moderate-to-severe traumatic brain injury

Area of Science:

• Neuroscience
• Radiology
• Pediatric Neurology

Background:

• Generalized brain volume loss and diffuse cerebral atrophy are known consequences of moderate-to-severe traumatic brain injury (TBI).
• Previous research indicates white matter may be more affected than gray matter in TBI.
• Specific regional differences in cortical gray matter thickness following TBI in pediatric populations have not been thoroughly investigated.

Purpose of the Study:

• To examine regional differences in cortical gray matter thickness in young TBI survivors.
• To compare cortical thickness in TBI subjects to demographically matched controls.
• To investigate the relationship between cortical thinning and neurobehavioral deficits, specifically working memory.

Main Methods:

• Utilized magnetic resonance imaging (MRI) scans from 16 young TBI subjects (ages 9-16) and 16 age- and sex-matched controls.
• Employed FreeSurfer software to perform volumetric analysis and assess cortical thickness.
• Correlated cortical thickness measurements with reported working memory performance.

Main Results:

• Significant global cortical thinning was observed in the TBI group compared to controls.
• Specific regions of reduced gray matter cortical thickness were identified in TBI survivors.
• Decreased cortical thickness correlated with deficits in working memory capacity.

Conclusions:

• Traumatic brain injury in young individuals leads to significant gray matter cortical thinning.
• These reductions in cortical thickness are associated with impaired working memory.
• TBI-induced cortical thinning likely results from both focal and diffuse brain injury mechanisms, with implications for long-term neurobehavioral sequelae.