The aim of the study was to monitor the natural history of new enhancing lesions in multiple sclerosis (MS) by means of serial gadolinium-enhanced magnetic resonance imaging (MRI). Out of the 63 new enhancing lesions seen on the baseline scan, belonging to 26 relapsing-remitting MS patients, 26 (40%), nine (14%) and four (6%) lesions showed persisting enhancement at first, second and third follow-up scan, respectively.