title: Distribution patterns of inflammatory sinonasal diseases.
abstract: OBJECTIVE
  There has been an increase in the demand for coronal sinus CT scan since the introduction of functional endoscopic sinus surgery; as the information provided by the scans assist the surgeon in the pre-operative plannings. Babbel and colleagues had demonstrated five distinctive patterns of recurring inflammatory sinonasal disease on CT scan. The aim of this study was to evaluate the patterns in the local population and to see if there was a difference compared to the Caucasian population.
  
  
  METHODS
  A retrospective review of 302 scans done between March 1993 and September 1995 was carried out. All scans were carried out using a 5 mm thickness to cover the posterior sinuses and a 3 mm thickness to cover the anterior sinuses. The scans were then grouped into the various patterns and an analysis was carried out comparing the differences in the patterns between the Chinese and the non-Chinese, and between the local population and the Caucasian population in Babbel's series.
  
  
  RESULTS
  There was no significant difference between the Chinese and the non-Chinese in the distribution of the various disease patterns. When compared to the Caucasian population, the local population had more sinonasal polyposis and sphenoethmoidal recess obstruction.
  
  
  CONCLUSIONS
  The smaller nasal passages of the Asians, particularly in the Chinese, could be the reason for the more prevalence of Type III and Type IV disease compared to the Caucasian population. The more constant and frequent exposure to allergens might also contribute to the increased prevalence of Type IV disease.
authors.affiliation: Department of Diagnostic Imaging, Tan Tock Seng Hospital, Singapore.
authors.forename: T Y
authors.initials: TY
authors.lastname: Tan
authors.forename: M
authors.initials: M
authors.lastname: Lin
authors.forename: F K
authors.initials: FK
authors.lastname: Cheah
authors.forename: D M
authors.initials: DM
authors.lastname: Koh
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D016009:Chi-Square Distribution; D002648:Child; D002681:China; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D017678:Sex Distribution; D012846:Singapore / Q000453:epidemiology; D012852:Sinusitis / Q000175:diagnosis / Q000453:epidemiology*; D014057:Tomography, X-Ray Computed; D044465:White People