Acute lacunar infarction on brain MRI

Brain MRI of a 71-year-old woman with a two-day history of left-sided ataxic hemiparesis. Left panels: Diffusion-weighted MRI sequences show two acute lesions, one in the cerebellum (top panel) and one in the thalamocapsular region (bottom panel). T2-weighted (middle panels) and FLAIR (right panels) MRI sequences correctly identify the lesions (arrows), but neither could be called "acute" without diffusion imaging. A high-risk cardiac source (an akinetic left ventricular segment) was found on echocardiogram.