Relationship between paramagnetic rim lesions and slowly expanding lesions in multiple sclerosis

Magnetic resonance imaging (MRI) markers for chronic active lesions in MS include slowly expanding lesions (SELs) and paramagnetic rim lesions (PRLs). To identify the relationship between SELs and PRLs in MS, and their association with disability. 61 people with MS (pwMS) followed retrospectively wi...

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Published in:Multiple sclerosis Vol. 29; no. 3; p. 352
Main Authors: Calvi, Alberto, Clarke, Margareta A, Prados, Ferran, Chard, Declan, Ciccarelli, Olga, Alberich, Manel, Pareto, Deborah, Rodríguez Barranco, Marta, Sastre-Garriga, Jaume, Tur, Carmen, Rovira, Alex, Barkhof, Frederik
Format: Journal Article
Language:English
Published: England 01.03.2023
Subjects:
Brain - pathology
Humans
Magnetic Resonance Imaging - methods
Multiple Sclerosis - pathology
Retrospective Studies
susceptibility-weighted imaging (SWI)
Chronic active lesions
volumetric MRI
paramagnetic rim lesions (PRLs)
multiple sclerosis
slowly expanding lesions (SELs)
ISSN:1477-0970, 1477-0970
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Summary:Magnetic resonance imaging (MRI) markers for chronic active lesions in MS include slowly expanding lesions (SELs) and paramagnetic rim lesions (PRLs). To identify the relationship between SELs and PRLs in MS, and their association with disability. 61 people with MS (pwMS) followed retrospectively with MRI including baseline susceptibility-weighted imaging, and longitudinal T1 and T2-weighted scans. SELs were computed using deformation field maps; PRLs were visually identified. Mixed-effects models assessed differences in Expanded Disability Status Scale (EDSS) score changes between the group defined by the presence of SELs and or PRLs. The median follow-up time was 3.2 years. At baseline, out of 1492 lesions, 616 were classified as SELs, and 80 as PRLs. 92% of patients had ⩾ 1 SEL, 56% had ⩾ 1 PRL, while both were found in 51%. SELs compared to non-SELs were more likely to also be PRLs (7% vs. 4%, = 0.027). PRL counts positively correlated with SEL counts (ρ= 0.28, = 0.03). SEL + PRL + patients had greater increases in EDSS over time (beta = 0.15/year, 95% confidence interval (0.04, 0.27), = 0.009) than SEL+PRL-patients. SELs are more numerous than PRLs in pwMS. Compared with either SELs or PRLs found in isolation, their joint occurrence was associated with greater clinical progression.
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ISSN:1477-0970
1477-0970
DOI:10.1177/13524585221141964