What does white matter multiple ischemic focus mean?

Multiple ischemic lesions in white matter of the brain, that is, multiple ischemic lesions in white matter of the brain, the brain is divided into gray matter and white matter, gray matter is mainly the place where neurons gather, while white matter is mainly the place where nerve conduction fibers gather. White matter is far less tolerant to ischemia than gray matter, only 1/2~1/4 of gray matter. Therefore, when combined with long-term hypertension, diabetes and other basic diseases, it often first shows ischemic lesions in white matter of the brain, and then develops into cerebral infarction. There is a clinical disease, subcortical arteriosclerosis encephalopathy, which is a typical representative of this kind of white matter disease. As the disease progresses, the ischemic symptoms will gradually worsen, and the patient will gradually show obvious mental and cognitive decline.