title: Hippocampus: a "forgotten" border zone of brain ischemia.
abstract: BACKGROUND
  Hippocampus is selectively susceptible to ischemic damage and it could be, in some conditions, considered as a border zone of brain ischemia.
  
  
  RESULTS
  We illustrate this concept with three cases of hippocampal diffusion-weighted imaging (DWI) restrictions secondary to a carotid artery dissection with an ipsilateral fetal posterior cerebral artery (PCA) in two cases and to global brain hypoperfusion consequent to a cardiac arrest in the last case.
  
  
  CONCLUSIONS
  The hypoperfusion induced by a cardiac arrest or an internal carotid dissection with an incomplete circle of Willis promotes hippocampal ischemia in the territories of the anterior choroidal artery and the longitudinal terminal segments of the hippocampal arteries.
authors.affiliation: Department of Neuroradiology, University Hospital of Dijon, 21033 Dijon Cedex, France.
authors.forename: Kamel
authors.initials: K
authors.lastname: Walha
authors.forename: Fréderic
authors.initials: F
authors.lastname: Ricolfi
authors.forename: Yannick
authors.initials: Y
authors.lastname: Béjot
authors.forename: Michel
authors.initials: M
authors.lastname: Nonent
authors.forename: Douraied
authors.initials: D
authors.lastname: Ben Salem
mesh_terms: D000328:Adult; D002545:Brain Ischemia / Q000175:diagnosis* / Q000209:etiology; D020215:Carotid Artery, Internal, Dissection / Q000150:complications / Q000175:diagnosis*; D005260:Female; D006624:Hippocampus / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed