Diffusion images show a large infarct core involving majority of brainstem, bilateral cerebella, and bilateral thalami (@Key Finding 1) as well as additional smaller likely microembolic infarcts throughout (both anterior and posterior circulation). FLAIR images show occlusion of the cerebral aqueduct (@Key Finding 2) due to the mass effect with resulting obstructive hydrocephalus and transependymal interstitial edema (@Key Finding 3).