1) Cerebrovascular disease 
A Microinfarct is a microscopic stroke less than 1 millimeter in size. Microinfarcts can be found in 25-50% of all elderly deceased persons. Microinfarcts may be the second most important cause of dementia, after Alzheimer`s disease. ...
(mi″kro-in´fahrkt) a very small infarct due to obstruction of circulation in capillaries, arterioles, or small arteries.