Paraventricular ischemic foci are not serious, and ischemic foci are caused by ischemia and necrosis of local brain tissue when the deep penetrating branches of small arteries in the brain become sclerotic and occluded. However, if there are more ischemic foci in the brain, it indicates the presence of small arteriosclerosis. Patients should prevent cerebrovascular disease because cerebral arteriosclerosis can easily lead to large cerebral infarction.