In this trial, patients will be observed if they develop early recurrent ischemic lesions (= ERILs) or silent neurologic ischemic lesions (= SNILs) after acute stroke or transitoric ischemic attack (TIA) based on atherothrombosis (LAA-stroke) on standard therapy during 30 days (day 7 and day 30 after acute event) via DW-MRI (diffusion-weighted magnetic resonance imaging).~We want to investigate if diffusion-weighted imaging of silent brain infarcts occuring during standard therapy is a suitable surrogate outcome measure for interventional studies
How many ERILs occur in caucasian patients with LAA stroke during 7 days on standard treatment?~How many SNILs occur between 7 and 30 days after acute ischemic event on standard treatment?~How many of during acute event diagnosed lesions (ERILs) are (still) detectable after 30 days?~Are there relevant risk faktors for the occurence of ERILs and SNILs (eg Diabetes or Biomarkers)?