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Isolated U-fiber involvement in MS: preliminary observations
Y Miki1, R I Grossman, J K Udupa
1Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104-4283, USA.
Neurology
|May 22, 1998
Summary
Isolated U-fiber lesions are common in multiple sclerosis (MS) and may impact cognitive function. This study explored their frequency, location, and correlation with disability and neuropsychological impairment in MS patients.
Area of Science:
- Neuroimaging
- Neurology
- Radiology
Background:
- Multiple sclerosis (MS) is a demyelinating disease affecting the central nervous system.
- U-fibers, or arcuate fascicles, connect adjacent cortical areas and are susceptible to MS lesions.
- The clinical significance of isolated U-fiber involvement in MS remains understudied.
Purpose of the Study:
- To investigate the frequency and anatomical distribution of isolated U-fiber lesions in MS patients.
- To explore the relationship between U-fiber lesions and physical disability (EDSS, AI).
- To assess the correlation between U-fiber lesions and neuropsychological impairment.
Main Methods:
- Fifty-three MS patients underwent MRI (T2-weighted and post-gadolinium T1-weighted sequences).
- Validated software quantified MS lesions, specifically focusing on U-fiber involvement.
- Patients completed the Expanded Disability Status Scale (EDSS), Ambulation Index (AI), and neurocognitive tests.
Main Results:
- Fifty-three percent of patients (28/53) had isolated U-fiber lesions (42 total lesions).
- The frontal lobe was the most common site (64.3%).
- Multiple U-fiber lesions correlated with poorer performance in executive control and memory tests (p < 0.05), but not EDSS or AI.
Conclusions:
- Isolated U-fiber involvement is an underappreciated finding in MS, detectable via MRI.
- U-fiber lesions may contribute to neuropsychological deficits in MS patients.
- Further research is needed to confirm the association between U-fiber lesions and cognitive impairment.