Hi, I was wondering if it's possible to have Lesions on the brain, but not have MS. My sister in law is 6 mo preg. she lost sight in her right eye and it is slowly coming back. She was diagnosed by a neuro with optic neuritis. She recently had an MRI and she was told that she had MS. She received a second opinion and he told her that she has a 50% chance of having MS. This gives her great relief, but I wonder which is more likely.