title: Radiological sinonasal anatomy. Exploring the Saudi population.
abstract: OBJECTIVE
  To assess the prevalence of common radiological variants of sinonasal anatomy among Saudi population and compare it with the reported prevalence of these variants in other ethnic and population groups.
  
  
  METHODS
  This is a retrospective cross-sectional study of 121 computerized tomography scans of the nose and paranasal sinuses of patients presented with sinonasal symptoms to the Department of Otorhinolarngology, King Fahad Hospital of the University, Khobar, Saudi Arabia, between January 2014 and May 2014.
  
  
  RESULTS
  Scans of 121 patients fulfilled inclusion criteria were reviewed. Concha bullosa was found in 55.4%, Haller cell in 39.7%, and Onodi cell  in 28.9%. Dehiscence of the internal carotid artery was found in 1.65%. Type-1 and type-2 optic nerve were the prevalent types. Type-II Keros classification of the depth of olfactory fossa was the most common among the sample (52.9%). Frontal cells were found in 79.3%; type I was the most common.
  
  
  CONCLUSIONS
  There is a difference in the prevalence of some radiological variants of the sinonasal anatomy between Saudi population and other study groups. Surgeon must pay special attention in the preoperative assessment of patients with sinonasal pathology to avoid undesirable complications.
authors.affiliation: Department of Otolaryngology/Head and Neck Surgery, College of Medicine, University of Dammam, Dammam, Kingdom of Saudi Arabia. E-mail. ra_rumaih@yahoo.com.
authors.forename: Redha A
authors.initials: RA
authors.lastname: Alrumaih
authors.forename: Mona M
authors.initials: MM
authors.lastname: Ashoor
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Obidan
authors.forename: Khulood M
authors.initials: KM
authors.lastname: Al-Khater
authors.forename: Saeed A
authors.initials: SA
authors.lastname: Al-Jubran
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009666:Nose / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D010256:Paranasal Sinuses / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D015995:Prevalence; D012189:Retrospective Studies; D012529:Saudi Arabia / Q000453:epidemiology; D014057:Tomography, X-Ray Computed; D055815:Young Adult