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Paramagnetic Rim Lesions and Development of Clinical MS in Radiologically Isolated Syndrome.

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This summary is machine-generated.

Paramagnetic rim lesions (PRLs) in radiologically isolated syndrome (RIS) predict the development of clinical multiple sclerosis (MS). Early detection of these MRI markers can guide treatment decisions for individuals with RIS.

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Area of Science:

  • Neurology
  • Radiology
  • Immunology

Background:

  • Radiologically isolated syndrome (RIS) is characterized by white matter lesions (WMLs), often with the central vein sign (CVS+L) and paramagnetic rim lesions (PRLs).
  • The predictive value of these MRI findings for the development of clinical multiple sclerosis (MS) remains unclear.

Purpose of the Study:

  • To assess the prognostic significance of MRI markers, specifically PRLs and CVS+L, in predicting clinical MS onset in individuals with RIS.
  • To identify key predictors of clinical MS development in the RIS population.

Main Methods:

  • A multicenter prospective cohort study involving 79 participants meeting RIS criteria.
  • Participants underwent 3-T MRI of the brain and spinal cord, with WML, PRL, and spinal cord lesion (SCL) counts, and CVS+L proportion assessed.
  • Time-varying Cox regression and elastic net regression were used to analyze the association between MRI findings and clinical MS development.

Main Results:

  • A higher PRL count was significantly associated with earlier symptom onset in both discovery and validation cohorts.
  • In the discovery cohort, having 4 or more PRLs predicted clinical MS (OR, 14.64).
  • In the validation cohort, any PRL presence significantly predicted clinical MS development (OR, 20.90).

Conclusions:

  • The presence and number of PRLs, indicating chronic active demyelination, are significant predictors of clinical MS development in individuals with RIS.
  • These findings highlight the potential clinical utility of MRI markers in guiding early treatment decisions for MS.
  • The results support the consideration of asymptomatic MS in diagnostic criteria and emphasize early detection for preventing disability.