title: Accuracy of limited four-slice CT-scan in diagnosis of chronic rhinosinusitis.
abstract: OBJECTIVE
  Chronic rhinosinusitis (CRS) is a common chronic health condition worldwide. Standard CT-scan is the method of choice for diagnosis of CRS but its high price and considerable radiation exposure have limited its application. The main goal of this study was to evaluate the accuracy of limited four-slice coronal CT-scan in the diagnosis of CRS.
  
  
  METHODS
  This cross-sectional study was conducted on 46 patients with CRS, for one year, based on American Society of Head and Neck Surgery criteria. All patients received the preoperative standard and four-slice CT-scans, after which endoscopic sinus surgery was performed. Findings of four-slice CT-scans were compared with those of conventional CT-scan and the sensitivity and specificity of four-slice CT-scan and its agreement with conventional CT-scan was calculated.
  
  
  RESULTS
  In this study, 46 patients including 32 males (69.6%) and 14 females (30.46%) with a mean age of 33 and standard deviation of 9 years, were evaluated. Sensitivity and specificity of four-slice CT-scan were 97.5% and 100%, respectively. Also, positive predictive value (PPV) and negative predictive value (NPV) of four-slice CT was 100% and 85.71%, respectively. There was a strong agreement between four-slice CT and conventional CT findings.
  
  
  CONCLUSIONS
  Considering the high sensitivity and specificity of four-slice CT-scan and strong agreement with conventional CT-scan in the diagnosis of CRS and the lower radiation exposure and cost, application of this method is suggested for both diagnosis and treatment follow-up in CRS.
authors.affiliation: Department of Otorhinolaryngology, Mashhad branch, Islamic Azad University, Arya Teaching Medical Hospital ENT Dept, Islamic Azad Medical University, Golestan 5, East Golestan Str, Jahanbany Street, Mashhad, Iran. Electronic address: raminzojaji@yahoo.com.
authors.forename: R
authors.initials: R
authors.lastname: Zojaji
authors.affiliation: Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Nekooei
authors.affiliation: Department of Radiology, Mashhad branch, Islamic Azad University, Mashhad, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Naghibi
authors.affiliation: Faculty of Medicine, Mashhad branch, Islamic Azad University, Mashhad, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Mazloum Farsi Baf
authors.affiliation: Faculty of Medicine, Mashhad branch, Islamic Azad University, Mashhad, Iran.
authors.forename: R
authors.initials: R
authors.lastname: Jalilian
authors.affiliation: Faculty of Medicine, Mashhad branch, Islamic Azad University, Mashhad, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Masoomi
mesh_terms: D000328:Adult; D002908:Chronic Disease; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D012189:Retrospective Studies; D012220:Rhinitis / Q000150:complications / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D012852:Sinusitis / Q000150:complications / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Chronic rhinosinusitis; Four-slice CT-scan; Sensitivity; Specificity