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  T2-Pseudonormalization and Microstructural Characterization in Advanced Stages of Late-infantile Metachromatic Leukodystrophy

Martin, P., Hagberg, G., Schultz, T., Harzer, K., Klose, U., Bender, B., et al. (2021). T2-Pseudonormalization and Microstructural Characterization in Advanced Stages of Late-infantile Metachromatic Leukodystrophy. Clinical Neuroradiology, 31(4), 969-980. doi:10.1007/s00062-020-00975-2.

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Martin, P, Autor
Hagberg, GE1, 2, Autor           
Schultz, T, Autor
Harzer, K, Autor
Klose, U, Autor
Bender, B, Autor           
Nägele, T, Autor
Scheffler, K1, 2, Autor           
Krägeloh-Mann , I, Autor
Groeschel, S, Autor
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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Purpose: T2-weighted signal hyperintensities in white matter (WM) are a diagnostic finding in brain magnetic resonance imaging (MRI) of patients with metachromatic leukodystrophy (MLD). In our systematic investigation of the evolution of T2-hyperintensities in patients with the late-infantile form, we describe and characterize T2-pseudonormalization in the advanced stage of the natural disease course.

Methods: The volume of T2-hyperintensities was quantified in 34 MRIs of 27 children with late-infantile MLD (median age 2.25 years, range 0.5-5.2 years). In three children with the most advanced clinical course (age >4 years) and for whom the T2-pseudonormalization was the most pronounced, WM microstructure was investigated using a multimodal MRI protocol, including diffusion-weighted imaging, MR spectroscopy (MRS), myelin water fraction (MWF), magnetization transfer ratio (MTR), T1-mapping and quantitative susceptibility mapping.

Results: T2-hyperintensities in cerebral WM returned to normal in large areas of 3 patients in the advanced disease stage. Multimodal assessment of WM microstructure in areas with T2-pseudonormalization revealed highly decreased values for NAA, neurite density, isotropic water, mean and radial kurtosis, MWF and MTR, as well as increased radial diffusivity.

Conclusion: In late-infantile MLD patients, we found T2-pseudonormalization in WM tissue with highly abnormal microstructure characterizing the most advanced disease stage. Pathological hallmarks might be a loss of myelin, but also neuronal loss as well as increased tissue density due to gliosis and accumulated storage material. These results suggest that a multimodal MRI protocol using more specific microstructural parameters than T2-weighted sequences should be used when evaluating the effect of treatment trials in MLD.

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 Datum: 2020-112021-12
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1007/s00062-020-00975-2
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Titel: Clinical Neuroradiology
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 31 (4) Artikelnummer: - Start- / Endseite: 969 - 980 Identifikator: ISSN: 1869-1439