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Related Experiment Video

Updated: Feb 18, 2026

4D Multimodality Imaging of Citrobacter rodentium Infections in Mice
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4H Leukodystrophy: Lessons from 3T Imaging.

Ferdy K Cayami1,2,3, Marianna Bugiani2,4,5, Petra J W Pouwels5,6

  • 1Department of Clinical Genetics, VU University Medical Center, Amsterdam, The Netherlands.

Neuropediatrics
|November 28, 2017
PubMed
Summary

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This summary is machine-generated.

New MRI findings in 4H leukodystrophy, including myelin islets and the "closed eye sign," improve diagnosis. Advanced 3T imaging reveals subtle features aiding identification of this rare genetic disorder.

Area of Science:

  • Neuroimaging
  • Genetics
  • Neurology

Background:

  • 4H leukodystrophy presents with hypomyelination, hypodontia, and hypogonadotropic hypogonadism.
  • Clinical variability necessitates advanced diagnostic tools like pattern recognition in MRI.
  • Mutations in POLR3A, POLR3B, and POLR1C are associated with 4H leukodystrophy.

Purpose of the Study:

  • To identify novel magnetic resonance imaging (MRI) features of 4H leukodystrophy using 3T MR imaging.
  • To compare 3T MRI findings with previously acquired 1.5T images.
  • To enhance the diagnostic accuracy of 4H leukodystrophy through detailed MRI analysis.

Main Methods:

  • Collected 3T MR imaging data from 12 patients with POLR3 gene mutations.
  • Compared 3T MRI data with 1.5T MRI data from 8 patients.

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  • Assessed specific MRI findings including myelin islets, closed eye sign, splenium lesions, and spinal cord hypomyelination.

    • Main Results:

    • Identified novel MRI findings: myelin islets (present in all patients), closed eye sign (medial lemniscus hypomyelination), and cyst-like lesions in the splenium (in 5 patients).
    • Myelin islets appeared as T1 hyperintense and T2 hypointense dots in the frontal and parietal white matter.
    • Spinal cord hypomyelination was observed in 10 patients with sagittal T2W imaging.

    Conclusions:

    • 3T MRI reveals additional diagnostic features for 4H leukodystrophy.
    • The identified MRI patterns, including myelin islets and the closed eye sign, aid in the diagnosis of 4H leukodystrophy.
    • Advanced MRI techniques improve the characterization and diagnosis of rare leukodystrophies.