Lacunar cerebral infarction refers to a small lesion of cerebral infarction, which can be clearly shown on imaging but actually has mostly no obvious clinical symptoms. Patients are found to have lesions during CT or MRI examinations, which are within 2 cm in diameter and can be single or multiple. This means that there can be only one lacunar infarct lesion in the brain, or several or even dozens of lacunar infarct lesions. In contrast, multiple cerebral infarction is for single cerebral infarction, which means that the number of cerebral infarction lesions is more, and can include lacunar cerebral infarction and other larger cerebral infarction, for example, patients have thalamic infarction, brainstem infarction and basal ganglia cerebral infarction at the same time, regardless of whether the size of the lesion is within 2cm or above 2cm, it should be called multiple cerebral infarction, so these two concepts are covered and distinguished from each other.