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Neuroradiological patterns and prognostic implications in type I Alexander disease.

Ylenia Vaia1, Filippo Arrigoni2, Liat Ben Sira3

  • 1C.O.A.L.A. (Center for Diagnosis and Treatment of Leukodystrophies), Unit of Pediatric Neurology, V. Buzzi Children's Hospital, Milan, Italy; Neuroscience Research Center, Department of Biomedical and Clinical Sciences, University of Milan, Milan, Italy.

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|June 18, 2026
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Summary

Distinct MRI patterns can predict disease progression in Type I Alexander Disease (AxD). Early identification of specific brain region involvement aids in prognostic stratification for this rare leukodystrophy.

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Area of Science:

  • Neurology
  • Radiology
  • Genetics

Background:

  • Type I Alexander Disease (AxD) is a rare, severe leukodystrophy with subtypes Ia-Id.
  • No prior studies have correlated MRI findings with clinical evolution in Type I AxD.
  • This research addresses the need for predictive markers in AxD management.

Purpose of the Study:

  • To identify specific MRI features that predict disease progression in Type I AxD.
  • To correlate initial MRI findings with clinical subtypes of Type I AxD.
  • To aid clinicians in early prognostic stratification for Alexander Disease patients.

Main Methods:

  • Recruited 47 genetically confirmed Type I AxD patients globally.
  • Collected clinical data and retrospectively classified patients by subtype.
  • Leukodystrophy experts analyzed initial MRI scans using an adapted AxD scoring protocol.

Main Results:

  • Specific MRI patterns were significantly associated with AxD subtypes.
  • Parietal, occipital, and temporal white matter involvement predicted Type Ib risk.
  • Occipital periventricular white matter patterns differentiated Type Ic from Type Id.

Conclusions:

  • Initial MRI scans reveal distinct patterns that may predict Type I AxD outcomes.
  • Key brain regions identified require careful evaluation for prognostic accuracy.
  • Further research is needed to validate these MRI-based prognostic markers.