Quantitative Measurement of Tissue Damage and Recovery Within New T2w Lesions in Pediatric- And Adult-Onset Multiple Sclerosis

Mult Scler. 2015 May;21(6):718-25. doi: 10.1177/1352458514551594. Epub 2014 Dec 5.

Abstract

Background: Children and adolescents with relapsing-remitting multiple sclerosis (RRMS) have a similar T2 lesion burden as adults matched for disease duration. However, it is unknown whether the degree of tissue destruction within lesions is also similar. Persistent reduced T1-weighted signal intensity within lesions indicates loss of tissue integrity.

Objective: We aimed to compare change over a 2-year period in T1 intensity within new T2 lesions, from pre-lesion levels to chronic post-lesion levels, between pediatric and adult-onset MS.

Methods: A two-point intensity-normalization method was used to generate normalized T1-weighted (NT1) images from T1-weighted data in 29 pediatric MS patients (age(mean±SD, years), disease duration (years)=15.7±2.4, 3.9±2.6) and 24 adult MS patients (36.7±8.9, 6.9±4.8). Subjects were imaged at three consecutive timepoints, 1 year apart. For each subject, a 'new-T2' lesion mask was created and the NT1 intensities 'pre-lesion', 'peri-lesion' and 'post-lesion' were determined. A longitudinal model was used to capture NT1 changes.

Results: The NT1 in both groups failed to recover to pre-lesion values by 1 year post-lesion (p=0.0002), with children showing significantly better recovery than adults (p=0.0089).

Conclusions: Both groups showed a significant chronic reduction of T1 intensity within new T2 lesions. However, children showed a significantly greater recovery of T1 intensity, suggesting that MS lesions in the pediatric MS population are less destructive, or that pediatric patients have greater reparative capacity.

Keywords: Axonal loss; MRI; T2 lesions; demyelination; multiple sclerosis; relapsing/remitting.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Age Factors
  • Age of Onset
  • Female
  • Follow-Up Studies
  • Humans
  • Magnetic Resonance Imaging / methods*
  • Male
  • Middle Aged
  • Multiple Sclerosis, Relapsing-Remitting / pathology*