title: Magnetic resonance imaging after most common form of concussion.
abstract: BACKGROUND
  Until now there is a lack of carefully controlled studies with conventional MR imaging performed exclusively in concussion with short lasting loss of consciousness (LOC).
  
  
  METHODS
  A MR investigation was performed within 24 hours and after 3 months in 20 patients who had suffered a concussion with a verified loss of consciousness of maximally 5 minutes. As a control group, 20 age- and gender matched patients with minor orthopaedic injuries had a MR investigation using the same protocol.
  
  
  RESULTS
  In a concussion population with an average LOC duration of 1. 4 minutes no case with unequivocal intracranial traumatic pathology was detected.
  
  
  CONCLUSIONS
  An ordinary concussion with short lasting LOC does not or only seldom result in a degree of diffuse axonal injury (DAI) that is visualized by conventional MR with field strength of 1.0 Tesla (T). Analysis of earlier MR studies in concussion using field strength of 1.5 T as well as of studies with diffusion tensor MR imaging (MR DTI) reveal methodological shortcomings, in particular use of inadequate control groups. There is, therefore, a need for carefully controlled studies using MR of higher field strength and/or studies with MR DTI exclusively in common concussion with LOC of maximally 5 minutes.
authors.affiliation: Department of Neurology and Clinical Neurophysiology, Trondheim University Hospital, 7006 Trondheim, Norway. harald.schrader@ntnu.no
authors.forename: Harald
authors.initials: H
authors.lastname: Schrader
authors.forename: Dalia
authors.initials: D
authors.lastname: Mickeviciene
authors.forename: Rymante
authors.initials: R
authors.lastname: Gleizniene
authors.forename: Silvija
authors.initials: S
authors.lastname: Jakstiene
authors.forename: Danguole
authors.initials: D
authors.lastname: Surkiene
authors.forename: Lars Jacob
authors.initials: LJ
authors.lastname: Stovner
authors.forename: Diana
authors.initials: D
authors.lastname: Obelieniene
mesh_terms: D000293:Adolescent; D000328:Adult; D001924:Brain Concussion / Q000150:complications* / Q000175:diagnosis*; D020833:Diffuse Axonal Injury / Q000175:diagnosis* / Q000209:etiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D055815:Young Adult