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A decrease in the size of the basal ganglia in children with fetal alcohol syndrome
S N Mattson1, E P Riley, E R Sowell
1Center for Behavioral Teratology, Department of Psychology, San Diego State University, California 92120, USA.
Insights
Children with fetal alcohol syndrome (FAS) show significant reductions in brain structures like the cerebral vault and basal ganglia. These brain volume differences may explain behavioral issues in individuals exposed to alcohol prenatally.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Medical Imaging
Background:
- Fetal alcohol syndrome (FAS) is a leading cause of preventable intellectual disability.
- Prenatal alcohol exposure can lead to a range of neurodevelopmental deficits.
- Structural brain abnormalities are commonly observed in FAS, but specific volumetric changes require detailed investigation.
Purpose of the Study:
- To investigate volumetric differences in specific brain regions between children with FAS and healthy controls.
- To determine if prenatal alcohol exposure is associated with proportional reductions in basal ganglia and caudate nucleus volumes.
- To explore the relationship between brain structure and potential behavioral outcomes in FAS.
Main Methods:
- Magnetic resonance imaging (MRI) was used to acquire brain scans.
- Volumetric analyses were performed on six children with FAS and seven age- and sex-matched controls.
- Statistical comparisons were made to identify significant differences in brain region volumes.
Main Results:
- Children with FAS exhibited significantly smaller volumes in the cerebral vault, basal ganglia, and diencephalon compared to controls.
- Both the caudate and lenticular nuclei, components of the basal ganglia, were significantly reduced in volume in the FAS group.
- Even after controlling for overall brain size, the proportional volume of the basal ganglia and caudate nucleus remained significantly reduced in children with FAS.
Conclusions:
- Fetal alcohol syndrome is associated with significant reductions in key brain structures, including the cerebral vault, basal ganglia, and diencephalon.
- The proportional reduction in basal ganglia and caudate nucleus volume, even when accounting for overall brain size, highlights specific neurodevelopmental impacts of prenatal alcohol exposure.
- These structural findings provide a potential neurobiological basis for the behavioral and cognitive deficits observed in individuals with FAS.
Abstract:
Magnetic resonance imaging was conducted on six children and adolescents with fetal alcohol syndrome and seven matched normal controls. Detailed volumetric analyses demonstrated significant reductions in the cerebral vault, basal ganglia, and diencephalon in the children with fetal alcohol syndrome, compared with control children. In addition, the volume of the cerebellar vault was smaller than controls in 4 of the 6 children with fetal alcohol syndrome, although the group difference did not reach significance. When the basal ganglia were divided into the caudate and lenticular nuclei, both of these regions were significantly reduced in the children with fetal alcohol syndrome. Finally, when the overall reduction in brain size was controlled, the proportional volume of the basal ganglia and, more specifically, the caudate nucleus was reduced in the children with fetal alcohol syndrome. These results may relate to behavioral findings in both humans and animals exposed to alcohol prenatally.