White matter microstructural abnormalities in children with severe congenital hypothyroidism

Area of Science:

• Neuroscience
• Endocrinology
• Developmental Pediatrics

Background:

• Congenital hypothyroidism (CH) requires early detection and treatment to prevent developmental issues.
• Newborn screening enables timely intervention for CH.
• Long-term neurodevelopmental outcomes in CH, particularly white matter integrity, require further investigation.

Purpose of the Study:

• To assess white matter microstructural integrity in children with severe CH treated early.
• To examine behavioral correlates of hearing, language, and communication in these children.
• To correlate brain imaging findings with behavioral outcomes.

Main Methods:

• Diffusion MR imaging (including tract-based spatial statistics and Spherical Mean Technique) was used.
• Behavioral assessments of hearing, language, and communication were conducted.
• 18 children with severe CH and 21 controls participated.

Main Results:

• Children with CH exhibited lower fractional anisotropy and higher radial diffusivity in key brain regions (cerebellum, thalami, temporal lobe).
• Microscopic diffusion metrics indicated reduced intra-neurite volume and altered transverse diffusivity in CH.
• Significant correlations were found between white matter integrity and behavioral measures in children with CH.

Conclusions:

• Early-treated severe CH is associated with significant white matter microstructural abnormalities.
• These abnormalities may persist despite timely newborn screening and treatment.
• Brain structure differences correlate with functional outcomes in hearing and communication.