Cerebral microstructural changes in children suffering from hemolytic uremic syndrome

Area of Science:

• Pediatric neurology
• Neuroradiology
• Medical imaging

Background:

• Hemolytic uremic syndrome (HUS) can cause neurological complications in children.
• Magnetic resonance imaging (MRI) is used to assess brain changes in HUS patients.
• Previous studies indicate potential MRI findings like T2 hyperintensities and altered diffusivity in basal ganglia, thalami, and white matter.

Purpose of the Study:

• To evaluate microstructural cerebral changes in pediatric HUS patients using apparent diffusion coefficient (ADC) maps.
• To compare quantitative ADC values with age-related reference values in healthy children.
• To correlate MRI findings with clinical outcomes in HUS patients.

Main Methods:

• Retrospective analysis of conventional MRI (1.5 T) in 12 pediatric HUS patients (0.8-14.6 years).
• Measurement of ADC values in 35 brain regions and comparison with published pediatric reference values.
• Qualitative assessment of diffusion-weighted imaging (DWI) lesions and quantitative analysis of ADC values, divided into subgroups based on neurological outcome.

Main Results:

• Qualitative DWI alterations with ADC correlates were observed in 80% of patients with poor neurological outcome (Subgroup A), primarily in basal ganglia and thalami.
• Patients with good neurological outcome (Subgroup B) did not show qualitative DWI alterations with ADC correlates, even with T2 lesions.
• Quantitative analysis revealed abnormal ADC values in all HUS patients, with a trend towards more affected regions in Subgroup A (median 16) compared to Subgroup B (median 11).

Conclusions:

• DWI and quantitative ADC measurements reveal differences between pediatric HUS patients with poor versus good neurological outcomes.
• ADC values suggest more widespread cerebral microstructural changes than qualitative findings alone.
• Both qualitative and quantitative MRI findings may serve as early prognostic indicators for neurological outcomes in pediatric HUS.