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The white bars represent group-A lesions; the gray bars represent group-B lesions. Patients with SPMS are marked with dotted columns. The graph reports the distribution of the mean MTR of group-A and group-B lesions per patient. The data refer to 15 patients. Of the 18 examined, 1 was excluded from the MTR evaluation because of the poor image quality and 1 because of presenting with no T2W image. Of the remaining 16 patients, all except 1 patient had at least 1 CBH.
