Reversible neurological ischemic deficit that lasts less than 24 hours. Reversible neurological deficit that lasts longer than 24 hours. Stroke caused by lack of blood supply. On CT scan acute infarcts may look like normal brain. After 24-48 hours, infarcts develop low density and edema.
Chronic infarcts are low density.
On CT hemmoragic infarcts are high intensity initially, usually with a mottled appearence, and gradually develop low intensity characteristics over days-weeks. Blood in the subarachnoid space. Usually caused by hypertension and rupture of blood vessal or aneurysm. Clot of blood is seen inside brain tissue. Rochester, Minnesota 1955-1974.