title: Hyperintense middle cerebral artery sign using MRI.
abstract: OBJECTIVE
  To assess whether the presence of the hyperintense middle cerebral artery (MCA) sign, detected using magnetic resonance imaging (MRI), has any prognostic value in subacute infarction. The results were also compared with computed tomography (CT).
  
  
  METHODS
  Twenty-five consecutive patients with suspected subacute ischaemic stroke (6-48 h after onset of symptoms) underwent MRI and CT assessment. The incidence of intraluminal thrombus demonstrated by conventional T1 and T2-weighted images was assessed. The results were correlated with National Institutes of Health Stroke Scale (NIHSS).
  
  
  RESULTS
  Hyperintense MCA was identifiable on T1-weighted images in 77.8% patients, on T2-weighted images in 61.1% patients, and in 38.9% patients using CT. Patients with intraluminal thrombus identified by MRI had more severe stroke (mean NIHSS of 12.2+/-8.0 versus 4+/-3.2 respectively, p=0.003).
  
  
  CONCLUSIONS
  The presence of hyperintense MCA by MRI is associated with higher NIHSS and may therefore have a prognostic value.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, Faculty of Medicine, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, People's Republic of China. wynnie@cuhk.edu.hk
authors.forename: W W M
authors.initials: WW
authors.lastname: Lam
authors.forename: K S
authors.initials: KS
authors.lastname: Wong
authors.forename: N M C
authors.initials: NM
authors.lastname: So
authors.forename: C
authors.initials: C
authors.lastname: Metreweli
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D020244:Infarction, Middle Cerebral Artery / Q000175:diagnosis* / Q000000981:diagnostic imaging; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D014057:Tomography, X-Ray Computed