The difference between ischemic foci and lacunar cerebral infarction mainly lies in the fact that lacunar cerebral infarction is due to the narrowing and occlusion of blood vessels, resulting in ischemia and necrosis of brain tissues supplied by blood vessels, and the necrotic brain tissues will be softened after a long time. Ischemic foci are invisible in head CT, but can be seen through magnetic resonance examination. Ischemic foci are also formed because of the obstruction of blood supply of small arteries in the brain, which leads to chronic ischemic and hypoxic changes in the patient’s brain tissue. There is no clear infarction, but it can be visualized on MRI, such as long T1 and long T2 signals on MRI, which is a manifestation of ischemia. But you won’t see cell necrosis or cell softening. Symptomatically, patients with lacunar cerebral infarction may or may not have acute symptoms of inflexible limb movement and speech clumsiness, but the ischemic foci will not lead to any neurological deficit symptoms.