I had an MRI of the brain in 1996 with abnormal white matter lesions and another one in 2005 with even more white matter lesions and am now supposed to have a lumbar puncture next week. The only symptom I seem to have is some incoordination of my 4th and 5th fingers on my left hand which makes it very hard to do my job as a medical transcritionist, which is why I had the MRI of the brain in 2005. The first MRI was done for a severe headache I got postoperatively. I do not have high blood pressure nor migraine headaches. I am quite tired all the time but have thought it was from narcotic pain meds for the chronic back pain. What is wrong with me? What are these lesions. They are nonspecific and scattered in the white matter. Are these lesions going to replace healthy brain, cause dementia?