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Dissemination in Time

DIT can be demonstrated by:

On one scan date:

Simultaneous presence of asymptomatic gadolinium-enhancing and nonenhancing lesions at any time.


Baseline scan and follow-up scan:

A new T2 and/or gadolinium-enhancing lesion(s) on follow-up MRI, with reference to a baseline scan, irrespective of the timing of the baseline MRI.