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MR imaging of brain maturation in normal and developmentally handicapped children
Insights
Magnetic resonance imaging reveals delayed white matter myelination in infants with neurodevelopmental handicaps. Specific conditions like seizures and infections show the most severe delays, aiding early diagnosis.
Area of Science:
- Neuroscience
- Developmental Biology
- Radiology
Background:
- White matter myelination is a critical developmental process in infants.
- Neurodevelopmental handicaps can significantly impact myelination.
- Early identification of myelination delays is crucial for timely intervention.
Purpose of the Study:
- To assess white matter myelination in neurodevelopmentally handicapped infants using magnetic resonance imaging (MRI).
- To compare myelination patterns across different etiological groups of handicapped infants.
- To evaluate MRI's utility in early detection of myelination delays.
Main Methods:
- T2-weighted MRI scans (spin echo 3,000/120 ms) were used to assess myelination.
- 91 neurodevelopmentally handicapped infants were studied, categorized by clinical diagnosis.
- Myelination scores were compared to those of 53 normal control subjects.
Main Results:
- Overall, myelination was delayed in the handicapped infant group.
- Infants with seizures or congenital infections exhibited the most severe myelination retardation.
- Infants with intracerebral hemorrhages showed myelination comparable to normal controls; birth asphyxia cases fell in between.
Conclusions:
- MRI-based staging of brain development, specifically myelination, is effective for early identification of delays in infants.
- Distinct patterns of myelination delay exist based on the underlying cause of neurodevelopmental handicap.
- This imaging technique aids in differentiating etiological factors contributing to developmental delays.
Abstract:
White matter myelination was assessed in the frontal, temporal, and occipital lobes and in the internal capsule in 91 neurodevelopmentally handicapped infants on T2-weighted images (spin echo 3,000/120 ms) and compared with myelination scores from 53 normal control subjects. Clinical diagnosis was birth asphyxia (34), seizures with delays of various causes (33), congenital infections (15), and intracerebral hemorrhages (9). Myelination in the total group of patients was generally delayed. However, we found distinct differences in myelin deposition between groups. Myelination of handicapped children with seizures or with intrauterine infections was retarded most severely at all ages. Children with intracerebral hemorrhages were almost never significantly different from normals in any part of the brain, whereas children with birth asphyxia had myelination scores in between. We conclude that magnetic resonance staging of developmental processes, such as myelination, in the infants' brain helps to recognize delays at an early age.