title: [False-negative native CT findings in the development of cerebral ischemia].
abstract: BACKGROUND
  The "fogging effect" in the native CT picture of the brain masks in case of a cerebrovascular attack the pathological finding of hypodensity by creating a neovascular net necessary for the clearing activity of macrophages.
  
  
  RESULTS
  The "fogging effect" was diagnosed on CT and monitored as a transient finding in a patient after a cerebrovascular attack. The submitted paper analyzes in detail and explains the dynamically developing clinical symptomatology of the patient.
  
  
  CONCLUSIONS
  The "fogging effect" can be the source of erroneous clinical interpretation of a CT finding. It is important to know about its existence, and in case of diagnostic doubts, consider the i.v. administration of a contrast substance even though the perfusion may temporarily deteriorate. Visualization of an ischaemic focus by contrast provides unequivocal evidence of the extent and site of malacia.
authors.affiliation: Neurologická klinika I. LF UK a VFN, Praha.
authors.forename: J
authors.initials: J
authors.lastname: Obenberger
authors.forename: Z
authors.initials: Z
authors.lastname: Seidl
mesh_terms: D000328:Adult; D001921:Brain / Q000000981:diagnostic imaging*; D002545:Brain Ischemia / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D011877:Radionuclide Imaging; D014057:Tomography, X-Ray Computed