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Memory dysfunction in multiple sclerosis corresponds to juxtacortical lesion load on fast fluid-attenuated

D M Moriarty1, A J Blackshaw, P R Talbot

  • 1Division of Imaging Science and Biomedical Engineering, University of Manchester, UK.

AJNR. American Journal of Neuroradiology
|December 10, 1999
PubMed
Abstract

Insights

Fast fluid-attenuated inversion-recovery (fast FLAIR) MRI detects more small lesions in multiple sclerosis (MS) patients. These juxtacortical lesions correlate with memory impairment, offering insights into MS cognitive dysfunction.

Area of Science:

  • Neuroimaging
  • Neurology
  • Cognitive Science

Background:

  • Multiple sclerosis (MS) diagnosis and prognosis rely on MR imaging, though its role remains debated.
  • Conventional spin-echo (CSE) and fast fluid-attenuated inversion-recovery (fast FLAIR) MR techniques offer different views of MS lesions.

Purpose of the Study:

  • To investigate the relationship between cognitive function and the size/location of MS lesions.
  • To compare lesion detection between CSE and fast FLAIR MR imaging.

Main Methods:

  • 18 patients with relapsing-remitting MS underwent matched CSE and fast FLAIR MRI scans.
  • Lesions were assessed for size, location, and appearance on both imaging types.
  • Neuropsychological tests evaluated general performance, memory, and executive function.

Main Results:

  • Fast FLAIR identified significantly more small and medium juxtacortical lesions than CSE (146 vs. 6 small; 18 vs. 4 medium).
  • Distinctive small juxtacortical lesions seen only on fast FLAIR suggest perivascular inflammation.
  • The number of these fast FLAIR-specific lesions correlated with poorer performance on memory tests.

Conclusions:

  • Fast FLAIR MRI reveals subtle juxtacortical lesions missed by CSE in MS.
  • These newly detected lesions are associated with memory deficits, highlighting their clinical relevance in MS cognitive impairment.

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