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Multiple sclerosis: a serial study using MRI in relapsing patients
1Department of Medicine, Health Sciences Centre Hospital, University of British Columbia, Vancouver, Canada.
Abstract:
Prospective monthly magnetic resonance imaging (MRI) studies were done over 6 months in seven relapsing MS patients. MRI and neurologic evaluations were compared for sensitivity in detecting disease activity. Four patients were clinically stable throughout the study. Three patients had five clinical relapses, two localized to the spinal cord and three to the brainstem. Eighteen new and ten enlarging MRI lesions were seen in five patients. Most lesions were less than 10 mm in diameter. All were clinically silent. Two patients developed major enlarging MRI lesions (seen in three slices) which increased in size over 2 months and then gradually became smaller over 2 months, leaving behind small residual areas of abnormality. There were 36 follow-up scans, 17 of which (47%) showed evidence for increasing activity. Thirteen (36%) of the scans had new lesions, most of them being small. This study shows that MRI evidence for disease activity in MS is much more frequent than is clinical evidence.
Insights
Magnetic resonance imaging (MRI) detected significantly more disease activity in multiple sclerosis (MS) patients than clinical evaluations. This highlights MRI
Area of Science:
- Neuroimaging
- Neurology
- Clinical Research
Background:
- Relapsing-remitting multiple sclerosis (MS) is characterized by unpredictable disease activity.
- Assessing disease progression and treatment efficacy requires sensitive monitoring methods.
Observation:
- Prospective monthly MRI scans were conducted over six months in seven MS patients.
- Neurologic evaluations were performed concurrently to compare detection sensitivity.
- Four patients remained clinically stable, while three experienced five relapses.
Findings:
- MRI revealed 18 new and 10 enlarging lesions in five patients, mostly small (<10 mm) and clinically silent.
- Two patients showed major enlarging lesions that evolved over time.
- 47% of follow-up scans (17/36) indicated disease activity, with 36% (13/36) showing new lesions.
Implications:
- MRI is substantially more sensitive than clinical assessment for detecting MS disease activity.
- Subtle, clinically silent MRI lesions may represent ongoing inflammatory processes.
- Enhanced MRI monitoring could refine understanding of MS pathogenesis and inform treatment strategies.