Hindbrain regional growth in preterm newborns and its impairment in relation to brain injury

Area of Science:

• Neuroscience
• Developmental Biology
• Medical Imaging

Background:

• Premature birth affects 11.1% of newborns globally, increasing risk for neurodevelopmental disability.
• Histological studies suggest differential growth in hindbrain subdivisions during the third trimester.
• Preterm brain injuries may selectively impact rapidly developing hindbrain areas, leading to region-specific deficits.

Purpose of the Study:

• To quantify regional growth of the cerebellum and brainstem in preterm neonates.
• To investigate associations between regional brain volumes and the severity of brain injury.
• To identify potential imaging biomarkers for predicting neurodevelopmental outcomes.

Main Methods:

• Utilized a mixed-effect linear model for analyzing longitudinal MRI scans from 65 preterm neonates.
• Quantified regional volumes of the cerebellum and brainstem.
• Correlated regional growth patterns with the presence and severity of brain injuries like intraventricular and cerebellar hemorrhage.

Main Results:

• In neonates without brain injury, the pons and lateral cerebellar lobes showed faster growth.
• Cerebral intraventricular hemorrhage and cerebellar hemorrhage were associated with distinct patterns of impaired cerebellar and brainstem growth.
• Observed cerebellar growth patterns closely matched histological data on cerebellar morphogenesis.

Conclusions:

• Regional brain growth in preterm neonates exhibits specific patterns that are altered by brain injury.
• Impaired growth patterns are linked to specific types of brain injury, suggesting distinct disruption mechanisms.
• The developed analytical framework shows promise for identifying predictive imaging biomarkers for neurodevelopmental outcomes in high-risk infants.