title: [Emergency imaging of cerebrovascular accidents].
abstract: Over the last 25 years, advances in neuroimaging have significantly changed the evaluation and management of acute stroke syndromes. In the seventies, computed tomography (CT) could differentiate between ischemic and hemorrhagic stroke. Magnetic resonance imaging (MRI) is nowadays the imaging modality of choice in the initial assessment of acute stroke. MRI images can better discriminate acute, subacute and chronic infarcts, differentiate venous from arterial infarcts, detect arterial dissection, stenosis or occlusion. Diffusion-weighted images are highly sensitive and specific to acute infarction and the combination with perfusion technique is suitable to define potentially reversible ischemia (area of cerebral "mismatch" which is thought to represent the so-called ischemic penumbra). This penumbra is a potential therapeutic target of valuable interest for the treating physician.
authors.affiliation: Service de Neuroradiologie Diagnostique et Interventionnelle, Hôpital G & R Laënnec, CHU de Nantes, France.
authors.forename: H A
authors.initials: HA
authors.lastname: Desal
authors.forename: E
authors.initials: E
authors.lastname: Auffray-Calvier
authors.forename: B
authors.initials: B
authors.lastname: Guillon
authors.forename: F
authors.initials: F
authors.lastname: Toulgoat
authors.forename: A
authors.initials: A
authors.lastname: Madoz
authors.forename: A
authors.initials: A
authors.lastname: De Kersaint-Gilly
authors.forename: A
authors.initials: A
authors.lastname: Pasco-Papon
mesh_terms: D000208:Acute Disease; D002545:Brain Ischemia / Q000175:diagnosis; D002533:Cerebral Angiography; D002543:Cerebral Hemorrhage / Q000175:diagnosis; D002544:Cerebral Infarction / Q000175:diagnosis; D003937:Diagnosis, Differential; D004630:Emergencies; D004638:Emergency Treatment / Q000379:methods*; D005343:Fibrinolytic Agents / Q000627:therapeutic use; D006801:Humans; D008279:Magnetic Resonance Imaging; D009485:Neuroradiography / Q000379:methods*; D018579:Patient Selection; D012680:Sensitivity and Specificity; D020521:Stroke / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy; D014057:Tomography, X-Ray Computed; D017585:Ultrasonography, Doppler, Transcranial
chemical_list: D005343:Fibrinolytic Agents