What specific causes of stroke need to be considered in a young patient?
Dissection, CADASIL, illicit drugs eg cocaine, endocarditis, Fabry's disease, hypercoagulable syndromes, MELAS, migraine hemiplegia, moyamoya, sickle cell disease, patent foramen ovale, congenital heart disease, PRES, reversible cerebral vasoconstriction syndrome, vasculitis.
MRI shows established infarct in the region predicted by the core infarct in the perfusion maps.