Was the mri done using ms protocol, or were they looking for stroke or tumour? An ms mri uses thinner slices (the
images are taken closer together so as to not miss smaller lesions). It would depend what they were looking for when you went in initially.
In my experience, if lesions are present and noted by radiologist, it is the radiologist who is.more likely to list ms demyelination as a possible cause, alongside other potential causes.