Not sure whether this Web page has been posted previously, but I ran across it while looking for info on small vessel ischemic disease. It talks about how various types of lesions (due to MS, migraine, etc. etc.) look on MRI. So many ways for the brain to dysfunction! :)
http://spinwarp.ucsd.edu/NeuroWeb/Text/br-840.htm
Unfortunately, there are some bullet boxes on the right hand side that hide part of the text, but you can still see most of it.
Nancy