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Neurodevelopmental and neuroimaging correlates in nonsyndromal microcephalic children
D A Custer1, L G Vezina, D R Vaught
1Department of Medical Genetics, Children's National Medical Center, Washington, DC 20010, USA.
Insights
In children with microcephaly, abnormal brain imaging findings are more indicative of developmental deficits than head size alone. Neuroimaging is crucial for assessing neurodevelopmental outcomes.
Area of Science:
- Pediatrics
- Neuroscience
- Developmental Biology
Background:
- Microcephaly is a condition characterized by an abnormally small head circumference.
- Developmental functioning in children with microcephaly can vary significantly.
- The relationship between head size, brain structure, and developmental outcomes requires further investigation.
Purpose of the Study:
- To investigate the correlation between head size (occipitofrontal head circumference), neuroimaging results, and developmental functioning in infants and young children diagnosed with absolute microcephaly.
- To determine whether the degree of microcephaly or the presence of brain abnormalities is a stronger predictor of developmental performance.
Main Methods:
- A descriptive study involving children aged 1 to 48 months with absolute microcephaly.
- Subjects were categorized into two groups based on occipitofrontal head circumference (OFC) standard deviations below the mean.
- Neuroimaging studies (MRI/CT scans) were analyzed for structural abnormalities, and developmental assessments were conducted.
Main Results:
- Abnormal neuroimaging findings were present in 62% of subjects, including cerebral atrophy, cortical dysplasia, myelination delay, and white matter hypoplasia.
- Children with abnormal brain images demonstrated significantly lower mean developmental scores across all areas compared to those with normal imaging.
- Developmental scores were notably lower in children with more severe microcephaly (Group B) who also had a higher incidence of abnormal imaging findings.
Conclusions:
- Abnormalities detected via neuroimaging appear to be a more reliable indicator of a child's developmental performance in microcephaly than the degree of head size reduction.
- Neuroimaging plays a critical role in understanding the neurodevelopmental impact of microcephaly.
- Early identification of brain abnormalities through neuroimaging can aid in predicting developmental trajectories.
Abstract:
This descriptive study examined the relationship between head size, developmental functioning, and neuroimaging findings in children with absolute microcephaly. Subjects, aged 1 to 48 months, were assigned to one of two groups based on occipitofrontal head circumference (OFC). Group A included subjects with an OFC of 2 to 2.99 standard deviations below the mean, and Group B included subjects with an OFC of 3 or more standard deviations below the mean. Brain scan findings for 62% of the subjects were abnormal. Findings included cerebral atrophy, cortical dysplasia, myelination delay, and white matter hypoplasia. Mean scores for developmental measures in Groups A and B were less than 70. Mean developmental scores in the normal imaging group were 70 or greater, whereas developmental scores in the abnormal imaging group were 52 or less. Forty-three percent of the subjects in Group A and 80% of those in Group B had abnormal findings from imaging studies (p = .0394). Subjects with one or more brain abnormalities determined on the basis of magnetic resonance images or computed tomographic scans had significantly lower scores in all developmental areas (p < .05). The authors concluded that abnormal brain images seem to be a better reflection of developmental performance than the degree of microcephaly. J Dev Behav Pediatr 21:12-18, 2000. Index terms: microcephaly, neuroimaging, neurodevelopment.