Cerebral volume and diffusion MRI changes in children with sensorineural hearing loss

Area of Science:

• Neuroscience
• Pediatrics
• Radiology

Background:

• Sensorineural hearing loss (SNHL) is the most common congenital sensory impairment in children.
• Understanding brain microstructure in SNHL can inform therapies for language development.

Purpose of the Study:

• To quantitatively assess cerebral volume and gray matter microstructure in children with SNHL using MRI.
• To investigate potential correlations between SNHL characteristics and brain structural differences.

Main Methods:

• Retrospective analysis of 3T MRI scans from 63 children with congenital SNHL and 64 age-matched controls.
• Atlas-based analysis to measure regional brain volumes and median diffusivity (ADC).
• Stratification of SNHL patients by severity and etiology (e.g., Pendrin mutations, Connexin 26).

Main Results:

• Children with SNHL showed increased ADC in the cortex, thalamus, caudate, and brainstem, along with smaller brainstem volumes compared to controls.
• Unilateral SNHL was associated with larger amygdala volumes.
• Specific genetic etiologies revealed distinct patterns: Pendrin mutations linked to higher brainstem ADC, and Connexin 26 mutations to higher thalamic and brainstem ADC.

Conclusions:

• Significant differences in brain diffusion and volume exist in children with SNHL, with specific regional findings.
• Genetic etiology influences brain microstructure alterations in SNHL.
• Longitudinal studies are warranted to track microstructural changes and predict intervention outcomes, such as cochlear implant success.