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Thalamic Volume Reduction in Cerebral Visual Impairment: Relationship to Visual Dysfunction
Marie Drottar1,2, Chan-Mi Kim1,2, Negin Nadvar1,2
1Laboratory of Neuroimaging and Vision Science, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA.
Journal of Child Neurology
|February 18, 2025
Summary
Cerebral visual impairment (CVI) is linked to reduced thalamic volume. Smaller thalamic and pulvinar volumes correlate with greater spatial navigation difficulties in individuals with CVI.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- The thalamus is essential for processing visual information.
- Damage to the developing thalamus can cause cerebral visual impairment (CVI).
Purpose of the Study:
- To quantify thalamic volume reductions in CVI.
- To examine the relationship between thalamic volume and CVI severity.
Main Methods:
- T1-weighted MRI scans analyzed for 23 individuals with CVI and 42 controls.
- CVI Questionnaire administered to assess visual dysfunction severity.
Main Results:
- Significant global thalamic volume reductions observed in CVI patients, especially those with periventricular leukomalacia.
- Reduced volumes in anterior, lateral, and ventral thalamic regions and specific nuclei were found.
- Smaller right thalamus and lateral pulvinar volumes correlated with increased difficulties in spatial navigation.
Conclusions:
- Aberrant thalamic development is a potential mechanism contributing to CVI.
- Quantitative MRI analysis reveals structural brain differences in CVI.
- Thalamic volume may serve as a biomarker for visual dysfunction severity in CVI.
Keywords:
CVI Questionnairecerebral (cortical) visual impairment (CVI)periventricular leukomalaciaprematuritythalamusvisual perceptionMore Related Videos
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