title: [Spiral computed tomographic analysis of frontal recess regions].
abstract: OBJECTIVE
  The purpose of the study was to determine the prevalence of frontal recess cells in Chinese patients who did not have frontal sinus disease related symptoms.
  
  
  METHODS
  Forty-nine Chinese patients without frontal sinus disease symptoms were undergone spiral computed tomography (CT). Then multiplanar reconstruction images were evaluated using a standard triplanar reconstruction protocol on a computer workstation.
  
  
  RESULTS
  The prevalence of agge rnasi cell was 94% (92/98). Sixty-four uncinate processes (65%, 64/98) had one superior attachment for each uncinate process, the other thirty-four uncinate processes (35%, 34/98) had two superior attachments for each uncinate process. The uncinate process' single superior attachment into the surrounding structures was identified to have the following distribution: 53% (52/98) to the lamina papyracea, 9% (9/98) to the middle turbinate, 3% (3/98) to the skull base. Most of the uncinate process' two superior attachments were either into the lamina papyracea and the skull base (24%, 23/98) or into the lamina papyracea and the middle turbinate (10%, 10/98). Only one uncinate process (1%) superiorly attached to the skull base and the middle turbinate. The prevalence of recessus terminalis was 87% (85/98). Of all the frontal cells identified in 32 sides (33%) of frontal recesses, the prevalence of type I, type II, type II and type IV cells were 23% (23 sides), 2% (2 sides), 7% (7 sides) and 0% (0 side) respectively. Supra bullar cell, frontal bullar cell and interfrontal septal cell were identified in 30 sides (31%), 7 sides (7%) and 7 patients (14%) respectively.
  
  
  CONCLUSIONS
  The result characterized normal frontal recess pneumatization in Chinese. That, together with the variations of the uncinate process' superior attachment emphasized the roles of agger nasi cell and the uncinate process in endoscopic frontal sinus surgery.
authors.affiliation: Department of Otorhinolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Beijing Institute of Otorhinolaryngology, Beijing 100730, China. Luozhang@trhos.com
authors.forename: Luo
authors.initials: L
authors.lastname: Zhang
authors.forename: De-min
authors.initials: DM
authors.lastname: Han
authors.forename: Wen-tong
authors.initials: WT
authors.lastname: Ge
authors.forename: Xin
authors.initials: X
authors.lastname: Ni
authors.forename: Jun-fang
authors.initials: JF
authors.lastname: Xian
authors.forename: Xian-zhong
authors.initials: XZ
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Zhou
authors.forename: Ping-dong
authors.initials: PD
authors.lastname: Li
mesh_terms: D000328:Adult; D000718:Anatomy, Regional; D005260:Female; D005626:Frontal Sinus / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D036542:Tomography, Spiral Computed; D055815:Young Adult