“…Studies on MS disease activity, such as clinical drug trials, indicate that the number of new MRI lesions is approximately 4–12 times larger than the number of new clinical relapses during the same time period 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20. Such “clinically silent” MRI lesions stress the importance of monitoring patients with MRI even in the absence of clinical signs of disease activity.…”