title: Boomerang sign on MRI.
abstract: BACKGROUND
  Altered mental status and more subtle cognitive and personality changes after traumatic brain injury (TBI) are pervasive problems in patients who survive initial injury. MRI is not necessarily part of the diagnostic evaluation of these patients.
  
  
  METHODS
  Case report with relevant image and review of the literature.
  
  
  RESULTS
  Injury to the corpus callosum is commonly described in traumatic brain injury; however, extensive lesions in the splenium are not well described. This image shows an important pattern of brain injury and demonstrates a common clinical syndrome seen in patients with corpus callosum pathology.
  
  
  CONCLUSIONS
  Injury to the splenium of the corpus callosum due to trauma may be extensive and can cause significant neurologic deficits. MRI is important in the diagnostic evaluation of patients with cognitive changes after TBI.
authors.affiliation: Department of Neurology, Neurovascular Service and Neurocritical Care Program, UCSF Medical Center, University of California, 505 Parnassus Avenue, Room M830, San Francisco, CA 94143-0114, USA. kghirsch@yahoo.com
authors.forename: Karen G
authors.initials: KG
authors.lastname: Hirsch
authors.forename: Robert E
authors.initials: RE
authors.lastname: Hoesch
mesh_terms: D000328:Adult; D001930:Brain Injuries / Q000473:pathology*; D003337:Corpus Callosum / Q000293:injuries* / Q000473:pathology*; D003422:Critical Care; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male