title: Hyperacute ischemic stroke missed by diffusion-weighted imaging.
abstract: We present two cases of hyperacute ischemic stroke that were initially missed by diffusion-weighted imaging; abnormalities in locations corresponding to focal neurologic deficits were discovered by MR angiography and perfusion-weighted imaging. Within hours, follow-up diffusion-weighted scans revealed partial conversion of the hypoperfused regions to complete stroke. These cases illustrate the potential for a nonresolving stroke-in-evolution to go undetected by diffusion-weighted imaging at hyperacute timepoints.
authors.affiliation: Department of Diagnostic Radiology, University of Maryland Medical System, Baltimore, MD 21201-1595, USA.
authors.forename: D
authors.initials: D
authors.lastname: Lefkowitz
authors.forename: M
authors.initials: M
authors.lastname: LaBenz
authors.forename: S R
authors.initials: SR
authors.lastname: Nudo
authors.forename: R E
authors.initials: RE
authors.lastname: Steg
authors.forename: J M
authors.initials: JM
authors.lastname: Bertoni
mesh_terms: D000208:Acute Disease; D000368:Aged; D000369:Aged, 80 and over; D002545:Brain Ischemia / Q000175:diagnosis*; D002343:Carotid Artery, Internal / Q000473:pathology; D016893:Carotid Stenosis / Q000175:diagnosis; D002544:Cerebral Infarction / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004058:Diffusion; D017352:Echo-Planar Imaging; D005260:Female; D006801:Humans; D007089:Image Enhancement; D007091:Image Processing, Computer-Assisted; D020244:Infarction, Middle Cerebral Artery / Q000175:diagnosis; D018810:Magnetic Resonance Angiography; D008279:Magnetic Resonance Imaging