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Abstract
Article abstract To elucidate the dynamics and the nature of normal-appearing white matter (NAWM) changes preceding new lesion formation in MS, the authors obtained weekly diffusion-weighted images for 12 weeks from 6 patients. NAWM areas subsequently involved by enhancement had a significant increase in mean diffusivity values starting 6 weeks before the appearance of enhancement (p values ranging between < 0.0001 and 0.04). This suggests that focal edema and demyelination play a part in the NAWM changes preceding new lesion formation in MS.
- Received February 18, 2000.
- Accepted in final form May 24, 2000.
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