title: Absence of nasal air flow and maxillary sinus development.
abstract: Paranasal sinuses development mechanisms are not well known. Nasal air flow, according to one of the proposed theories, would be fundamental to the growth and healthy development of paranasal sinuses.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the maxillary sinus growth and health in the presence and absence of postnasal air flow through a unique model.
  
  
  METHODS
  Retrospective study of a series of cases; preoperative CT scans of 7 patients with unilateral choanal atresia, average age was 16.28 years (+/- 5.024). This study was done in a tertiary hospital, with patients treated between 1994 and 2004. The area of the maxillary sinuses was measured with the aid an Auto-Cad software. Kruskal-Wallis test was used in the statistical analysis.
  
  
  RESULTS
  Symmetrical or even bigger maxillary sinuses were found in the same side of the choanal atresia in 85.71% of the cases. There was no significant statistic difference between compared sides. CT Scan signs of sinus disease were not seem in these patients.
  
  
  CONCLUSIONS
  These findings oppose the commonly accepted theory about the role of nasal air flow in health and development of paranasal cavities.
authors.affiliation: USP, Rib. Preto.
authors.forename: Roberto Eustáquio Dos Santos
authors.initials: RE
authors.lastname: Guimarães
authors.forename: Gustavo Coelho
authors.initials: GC
authors.lastname: Dos Anjos
authors.forename: Celso Gonçalves
authors.initials: CG
authors.lastname: Becker
authors.forename: Helena Maria Gonçalves
authors.initials: HM
authors.lastname: Becker
authors.forename: Paulo Fernando Tormin Borges
authors.initials: PF
authors.lastname: Crosara
authors.forename: Cláudia Pena
authors.initials: CP
authors.lastname: Galvão
mesh_terms: D000293:Adolescent; D000328:Adult; D000403:Airway Resistance / Q000502:physiology*; D002648:Child; D002754:Choanal Atresia / Q000000981:diagnostic imaging / Q000473:pathology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging / Q000473:pathology*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed