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Multiple Sclerosis l: Introduction01:19

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Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...

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Comprehensive Autopsy Program for Individuals with Multiple Sclerosis
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Diffusely abnormal white matter in chronic multiple sclerosis: imaging and histopathologic analysis.

Alexandra Seewann1, Hugo Vrenken, Paul van der Valk

  • 1Department of Neurology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands. a.seewann@vumc.nl

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Diffuse white matter abnormalities (DAWM) in multiple sclerosis (MS) show distinct pathology, including axonal loss and gliosis, differing from normal tissue and focal lesions. These findings suggest DAWM significantly contributes to MS progression and disability.

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Area of Science:

  • Neuroimaging
  • Neuropathology
  • Multiple Sclerosis Research

Background:

  • Diffuse white matter abnormalities (DAWM) on MRI may drive clinical disability in multiple sclerosis (MS).
  • The underlying pathology and MRI characteristics of DAWM in chronic MS remain largely uncharacterized.

Purpose of the Study:

  • To elucidate the histopathologic and radiologic features of DAWM in chronic multiple sclerosis.
  • To differentiate DAWM from normal-appearing white matter and focal lesions in MS.

Main Methods:

  • Postmortem correlative study combining MRI and histopathology on 17 brain slices from 10 chronic MS patients.
  • Region-of-interest analysis comparing radiologically defined DAWM, normal-appearing WM, and focal WM lesions.
  • Correlation of quantitative MRI measures (T1/T2 relaxation times, fractional anisotropy) with histopathologic findings (axonal loss, myelin density, gliosis).

Main Results:

  • DAWM exhibits extensive axonal loss, reduced myelin density, and chronic fibrillary gliosis, distinct from normal WM and focal lesions.
  • Increased T1 and T2 relaxation times and decreased fractional anisotropy were observed in DAWM.
  • These MRI changes correlated with significant axonal loss, reduced myelin density, and chronic gliosis.

Conclusions:

  • DAWM represents a distinct pathological entity in chronic MS, differing from normal-appearing WM and focal lesions.
  • DAWM likely arises from cumulative inflammation and axonal damage, contributing significantly to MS disease progression.
  • DAWM may serve as a novel imaging biomarker for neurodegeneration in MS clinical trials.