I have asked this question before. I had my 4th stroke a couple weeks ago. The ER doctor came in and said he had "good news and bad news". The stroke left a spot on my brain, but no major damage detected. Then he said from my last tests, the white matter disease has become larger. Just as I started to ask what this means, he had an emergency and left. I have called and left messages for him, but no answer yet. I googled and can not find anything solid on the subject. I would rather argue with you guys and gals about bringing CPF back, but this is worrying me. Sorry for the long post.