Silent stroke
Lacunar infarcts (LACI) are small (0.2 to 15 mm in diameter) noncortical (does not happen in the cerebral cortex) stroke caused by the blockage of a single penetrating branch of a larger blood vessel that brings blood to the inside parts of the brain including the  white matter. LACIs are usually happen in cases of white matter lesions (WML) which can be seen using computerized tomography (CT scans).