Objective To investigate the relationship between the level of serum cystatin C(CysC)and cognitive function in patients with acute cerebral lacunar infarction caused by small vessel disease.Methods One hundred twenty-three patients with acute cerebral lacunar infarction were divided into 3 groups according to serum cysta- Objective To investigate the relationship between the level of serum cystatin C (CysC) and cognitive function in patients with acute cerebral lacunar infarction caused by small vessel disease. Methods One hundred twenty-three patients with acute cerebral lacunar infarction were divided into 3 groups according to serum cysta-