Quantitative MRI analysis of the brain after twenty-two years of neuromyelitis optica indicates focal tissue damage

Mihaly Aradi, Edit Koszegi, Gergely Orsi, Gabor Perlaki, Anita Trauninger, Arnold Toth, Attila Schwarcz, Zsolt Illes

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

BACKGROUND: The long-term effect of neuromyelitis optica (NMO) on the brain is not well established.

METHODS: After 22 years of NMO, a patient's brain was examined by quantitative T1- and T2-weighted mono- and biexponential diffusion and proton spectroscopy. It was compared to 3 cases with short-term NMO and 20 healthy subjects.

RESULTS: Although routine T1- and T2-weighted images appeared to be normal, quantitative T1-, T2- and diffusion-weighted magnetic resonance imaging identified areas with high diffusivity and altered relaxation time in 'normal appearing white matter' (NAWM). In such abnormal NAWM regions, biexponential diffusion analysis and quantitative spectroscopy indicated extracellular edema and axonal loss, respectively. Repeated analysis 6 months later identified the same alterations. Such patchy alterations were not detectable in the NAWM of the 3 cases with short-term NMO, and they were also not quantitatively different from the controls.

CONCLUSION: After NMO of 22-year duration, metabolic changes, altered diffusivity and magnetic resonance relaxation features of patchy brain areas may suggest tissue damage in NAWM that persist for at least 6 months.

Original languageEnglish
JournalEuropean Neurology
Volume69
Issue number4
Pages (from-to)221-225
ISSN0014-3022
DOIs
Publication statusPublished - 2013

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Keywords

  • Adult
  • Brain
  • Diffusion Magnetic Resonance Imaging
  • Female
  • Humans
  • Longitudinal Studies
  • Magnetic Resonance Imaging
  • Neuromyelitis Optica
  • Protons
  • Spectrum Analysis
  • Young Adult

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