title: [Acute appendicitis in non-contrast spiral CT: a diagnostic luxury or benefit?].
abstract: OBJECTIVE
  To evaluate the diagnostic accuracy of thin collimated unenhanced spiral-CT in patients with clinically suspected acute appendicitis and to determine the impact on patient management and overall costs.
  
  
  METHODS
  Unenhanced focussed appendiceal spiral-CT was performed in 56 patients (23 women and 33 men) with clinically suspected acute appendicitis. Scans were obtained from the L4 level to the symphysis pubis using 5 mm collimation, 7.5 mm table feed (pitch 1.5) and 4 mm increment without i.v., oral, or rectal contrast material. Prospective diagnoses based on CT findings were compared with surgical (and histopathological) results and clinical follow-up. The effect of spiral-CT on patient management and clinical resources was assessed.
  
  
  RESULTS
  29 patients (10 women and 19 men) underwent appendectomy. Unenhanced spiral-CT was an accurate imaging technique for the initial examination of patients with suspected acute appendicitis with a sensitivity of 95.4% and a specificity 100%, an accuracy of 98.2%, a positive predictive value of 100%, and a negative predictive value of 97.1%. In 27 patients with no evidence of acute appendicitis, an alternative diagnosis could be made in 24 patients by unenhanced spiral-CT.
  
  
  CONCLUSIONS
  Unenhanced spiral-CT is an accurate test to diagnose or to exclude acute appendicitis. Routine appendiceal spiral-CT can improve medical care and reduce the overall costs for patients suspected of having acute appendicitis.
authors.affiliation: Universitätsklinik für Radiologie, Graz.
authors.forename: R
authors.initials: R
authors.lastname: Stacher
authors.forename: H
authors.initials: H
authors.lastname: Portugaller
authors.forename: K W
authors.initials: KW
authors.lastname: Preidler
authors.forename: A J
authors.initials: AJ
authors.lastname: Ruppert-Kohlmayr
authors.forename: U
authors.initials: U
authors.lastname: Anegg
authors.forename: H
authors.initials: H
authors.lastname: Rabl
authors.forename: E
authors.initials: E
authors.lastname: Spuller
authors.forename: D H
authors.initials: DH
authors.lastname: Szolar
mesh_terms: D000208:Acute Disease; D000328:Adult; D001064:Appendicitis / Q000000981:diagnostic imaging*; D001065:Appendix / Q000000981:diagnostic imaging; D003287:Contrast Media; D003365:Costs and Cost Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000191:economics / Q000295:instrumentation / Q000379:methods*
chemical_list: D003287:Contrast Media