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Updated: May 22, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
A diffusion tensor imaging and neurocognitive study of HIV-positive children who are HAART-naïve "slow progressors"
Jacqueline Hoare1, Jean-Paul Fouche, Bruce Spottiswoode
1Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa. hoare.jax@googlemail.com
Insights
Children with slow-progressing HIV infection show significant cognitive deficits and brain changes. Demyelination in key brain areas like the corpus callosum may explain these neurodevelopmental issues.
Area of Science:
- Neuroscience
- Pediatrics
- Infectious Diseases
Background:
- Few studies examine neurocognitive outcomes in children with slow-progressing HIV.
- Slow progressors are vertically infected children with minimal antiretroviral therapy.
Purpose of the Study:
- To compare neuropsychological and neuroimaging findings in asymptomatic, slow-progressing HIV-positive children versus controls.
- To investigate brain structural changes, particularly in white matter tracts, associated with slow HIV progression.
Main Methods:
- Compared 12 asymptomatic HIV-positive children (8-12 years) with matched controls.
- Utilized a neuropsychological battery and diffusion tensor imaging (DTI).
- Focused DTI analysis on the corpus callosum, internal capsule, and superior longitudinal fasciculus.
Main Results:
- HIV-positive children performed worse on IQ, visuospatial processing, visual memory, and executive functioning tests.
- Observed lower fractional anisotropy (FA) and higher mean diffusivity (MD) and radial diffusivity (RD) in the corpus callosum of slow progressors.
- Found increased MD in the superior longitudinal fasciculus and correlations between cognitive deficits and white matter integrity.
Conclusions:
- Slow-progressing pediatric HIV infection is associated with significant cognitive impairment.
- Neuroimaging reveals white matter abnormalities, suggesting demyelination as a key pathological process.
- Findings highlight the need for monitoring and intervention in this vulnerable pediatric population.
Abstract:
There are few neuropsychological or neuroimaging studies of HIV-positive children with "slow progression". "Slow progressors" are typically defined as children or adolescents who were vertically infected with HIV, but who received no or minimal antiretroviral therapy. We compared 12 asymptomatic HIV-positive children (8 to 12 years) with matched controls on a neuropsychological battery as well as diffusion tensor imaging in a masked region of interest analysis focusing on the corpus callosum, internal capsule and superior longitudinal fasciculus. The "slow progressor" group performed significantly worse than controls on the Wechsler Abbreviated Scale of Intelligence Verbal and Performance IQ scales, and on standardised tests of visuospatial processing, visual memory and executive functioning. "Slow progressors" had lower fractional anisotropy (FA), higher mean diffusivity (MD) and radial diffusivity (RD) in the corpus callosum (p= <0.05), and increased MD in the superior longitudinal fasciculus, compared to controls. A correlation was found between poor performance on a test of executive function and a test of attention with corpus callosum FA, and a test of executive function with lowered FA in the superior longitudinal fasiculus. These data suggest that demyelination as reflected by the increase in RD may be a prominent disease process in paediatric HIV infection.
