title: The comparative study on diagnostic validity of cerebral aneurysm by computed tomography angiography versus digital subtraction angiography after subarachnoid hemorrhage.
abstract: BACKGROUND
  In order to declare the preoperative diagnostic value of brain aneurysms, two radiological modalities, computed tomographic angiography and digital subtraction angiography were compared.
  
  
  METHODS
  In this descriptive analytic study, diagnostic value of computed tomographic angiography (CTA) was compared with digital subtraction angiography (DSA). Sensitivity, specificity, positive and negative predictive values were calculated and compared between the two modalities. All data were analyzed with SPSS software, version 16.
  
  
  RESULTS
  Mean age of patients was 49.5 ± 9.13 years. 57.9 % of subjects were female. CTA showed 89% sensitivity and 100% specificity whereas DSA demonstrated 74% sensitivity and 100% specificity. Positive predictive value of both methods was 100%, but negative predictive value of CTA and DSA was 85% and 69%, respectively.
  
  
  CONCLUSIONS
  Based on our data, CTA is a valuable diagnostic modality for detection of brain aneurysm and subarachnoid hemorrhage.
authors.affiliation: Associated Professor of Neurosurgery, Department of Neurosurgery, Alzahra Hospital, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Masih
authors.initials: M
authors.lastname: Saboori
authors.forename: Ali
authors.initials: A
authors.lastname: Hekmatnia
authors.forename: Amirhossein
authors.initials: A
authors.lastname: Ghazavi
authors.forename: Reza
authors.initials: R
authors.lastname: Basiratnia
authors.forename: Navid
authors.initials: N
authors.lastname: Omidifar
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Hekmatnia
authors.forename: Homayoon Naji
authors.initials: HN
authors.lastname: Isfahani