small lacunar infarct in brainsmall chronic lacunar infarctmultiple lacunar infarcts in brainmultiple chronic lacunar infarctslacunar brainchronic lacunarcerebral lacunar infarctperiventricular lacunar infarctchronic cerebral infarctionlacunar infarct caudate nucleuswhite matter lacunar infarctbrain smart