title: [The CT scan of the agger cell and its adjacent structure in endoscopic paranasal sinus surgery].
abstract: OBJECTIVE
  To promote the development of endoscopic frontal sinus surgery and naso-lacrimal anastomosis surgery by studying the agger cells and their adjacent structures.
  
  
  METHODS
  One hundred patients were observed by the continuous coronal CT scan and sagittal CT scan of the paranasal sinuses. Among them, 30 had deviation of nasal septum; 40 had chronic nasosinusitis. There were 80 adult and 20 children.
  
  
  RESULTS
  (1) The agger cells existed in 99% of the cases, the development of the agger cells in 9-16 years old children, and adult had no difference; (2) The morphology of agger cells differed widely, but its relationship to the anterior border of the middle nasal concha, bulla ethmoidalis and nasolacrimal canal was quite stable; (3) The upward pneumatization of the agger cells was not related to deviation of nasal septum, but closely related to the development of the frontal sinus; (4) The anterior nasosinusitis often influenced the agger cells and might result in hyperosteogeny.
  
  
  CONCLUSIONS
  The agger cells situated at the pathway of the intranasal frontal sinus during surgery and dacryocystorhinostomy, the nasal CT scan might be beneficial to the prevention of surgical complications.
authors.affiliation: Department of Otorhinolaryngology, China-Japan Friendship Hospital, Beijing 100029.
authors.forename: N
authors.initials: N
authors.lastname: Wang
authors.forename: W
authors.initials: W
authors.lastname: Fan
authors.forename: H
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003608:Dacryocystorhinostomy / Q000379:methods; D004724:Endoscopy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009666:Nose / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D010256:Paranasal Sinuses / Q000000981:diagnostic imaging* / Q000601:surgery; D014057:Tomography, X-Ray Computed