title: Dynamic Evolution of Diffusion-Weighted Imaging Lesions in Patients With Minor Ischemic Stroke.
abstract: OBJECTIVE
  Diffusion-weighted imaging (DWI) lesion volume on magnetic resonance imaging is increasingly being used as a surrogate outcome measure in clinical trials. We aimed to characterize the evolution of DWI lesion volumes within 30 days of symptom onset after minor stroke.
  
  
  METHODS
  Minor stroke patients with DWI lesions on magnetic resonance imaging within 48 hours of symptom onset were prospectively followed with magnetic resonance imaging brain scan at 7 and 30 days. Change in the lesion volume was defined as the difference between day 30 Fluid-Attenuated Inversion Recovery and baseline DWI lesion volumes.
  
  
  RESULTS
  Three patterns of infarct evolution were observed: reduction (72 [63%]), no change (26 [23%]), and growth (16 [14%]). Patients with infarct reduction at 30 days had larger baseline DWI lesion volumes (2.5 [0.9-8.5] mL) than those with stable infarcts (0.5 [0.3-0.9] mL; P=0.01). Complete DWI reversal at day 30, was seen in only 6 (5.3%) patients.
  
  
  CONCLUSIONS
  The most common pattern of infarct evolution in patients with minor stroke is a reduction in volume, but complete resolution is uncommon.
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada.
authors.forename: Mahesh P
authors.initials: MP
authors.lastname: Kate
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada.
authors.forename: Parnian
authors.initials: P
authors.lastname: Riaz
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada.
authors.forename: Laura
authors.initials: L
authors.lastname: Gioia
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada.
authors.forename: Leka
authors.initials: L
authors.lastname: Sivakumar
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada.
authors.forename: Thomas
authors.initials: T
authors.lastname: Jeerakathil
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada.
authors.forename: Brian
authors.initials: B
authors.lastname: Buck
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada.
authors.forename: Christian
authors.initials: C
authors.lastname: Beaulieu
authors.affiliation: From the Division of Neurology, Department of Medicine (M.P.K., P.R., L.G., L.S., T.J., B.B., K.B.) and Department of Biomedical Engineering (C.B.), University of Alberta, Edmonton, Canada. ken.butcher@ualberta.ca.
authors.forename: Kenneth
authors.initials: K
authors.lastname: Butcher
mesh_terms: D000368:Aged; D002545:Brain Ischemia / Q000175:diagnosis* / Q000378:metabolism*; D038524:Diffusion Magnetic Resonance Imaging / Q000639:trends*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D020521:Stroke / Q000175:diagnosis* / Q000378:metabolism*
keywords: brain infarction; diffusion-weighted magnetic resonance imaging; stroke