title: Comparative study of the pneumatization of the mastoid air cells and paranasal sinuses using three-dimensional reconstruction of computed tomography scans.
abstract: OBJECTIVE
  The purpose of this study was to investigate the relationship between the pneumatization of mastoid air cells and PNS using three-dimensional (3D) reconstruction of computed tomography (CT) scans of the PNS.
  
  
  METHODS
  A retrospective review of PNS CT scans from 60 cases was performed. Patients with evidence of sinusitis or mastoiditis, or a history of head trauma, were excluded from the study. Volumes were measured using 3D reconstruction based on axial images of 1 mm thickness. Volumes of the mastoid air cells (right and left), frontal sinus, sphenoid sinus, and maxillary sinuses (right and left) were obtained and compared using statistical analysis.
  
  
  RESULTS
  The volume of mastoid air cells and sinuses did change with age, but the volumes of male subjects were larger than those of females. There was a positive correlation between the pneumatization of mastoid air cells and that of the sphenoid sinus; however, no relationship was observed between the volume of mastoid air cells and that of the maxillary sinuses.
  
  
  CONCLUSIONS
  This study examined whether a similarity in pneumatization exists between the mastoid air cells and PNS of individuals; these results may be useful in understanding the normal and pathological conditions of both structures.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, College of Medicine, The Catholic University of Korea, Uijeongbu St. Mary's Hospital, #65-1 Geumo-Dong, Uijeongbu, Gyeonggi-Do, 480-717, Korea. juanent@catholic.ac.kr
authors.forename: Joohwan
authors.initials: J
authors.lastname: Kim
authors.forename: Sun Wha
authors.initials: SW
authors.lastname: Song
authors.forename: Jin-Hee
authors.initials: JH
authors.lastname: Cho
authors.forename: Ki-Hong
authors.initials: KH
authors.lastname: Chang
authors.forename: Beom Cho
authors.initials: BC
authors.lastname: Jun
mesh_terms: D000293:Adolescent; D000328:Adult; D000388:Air / Q000032:analysis; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008416:Mastoid / Q000166:cytology* / Q000000981:diagnostic imaging; D008443:Maxillary Sinus / Q000000981:diagnostic imaging; D008875:Middle Aged; D010256:Paranasal Sinuses / Q000000981:diagnostic imaging*; D012016:Reference Values; D013101:Sphenoid Sinus / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult