无症状脑梗死 (ＳＢＩ)是指无卒中史而由神经影像学或尸检发现的脑梗死 ,其症状可能未被认识或被病人遗忘。　　近年来随着ＣＴ及ＭＲＩ的广泛应用及国内外盛行的脑的定期健康检查 ,发现ＳＢＩ的广泛存在 ,特别是老年人更为常见。因此 ,对ＳＢＩ与症状性脑梗死、痴呆及假性球麻 Asymptomatic cerebral infarction (SBI) refers to cerebral infarction found by neuroimaging or autopsy without a history of stroke whose symptoms may not be known or forgotten by the patient. In recent years, with the extensive application of CT and MRI as well as the regular brain health examination at home and abroad, it is found that the widespread presence of SBI, especially in the elderly is more common. Therefore, SBI and symptomatic cerebral infarction, dementia and pseudo-cannabis