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Magnetic resonance imaging (MRI) can be a very useful tool in diagnosing and monitoring multiple sclerosis (MS). New MS lesions will typically "enhance" with dye for about six weeks. MS lesions older than six weeks or so will no longer enhance, but will still leave behind a bright white area on certain MRI images. The typical person with relapsing-remitting MS who is not on any treatment will have an enhancing lesion on brain MRI about 50 percent of the time.
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