title: [Study of computed tomographic dacryocystography used in endoscopic intranasal dacryocystorhinostomy preoperatively].
abstract: OBJECTIVE
  To study computed tomographic dacryocystography used in endoscopic intranasal dacryocystorhinostomy preoperatively.
  
  
  METHODS
  Ten volunteers and twelve patients with dacryocystitis were undergone the coronary and axial computed tomographic dacryocystography.
  
  
  RESULTS
  According to the anatomic relationship between anterior ethmoid sinus and fossa of lacrimal sac, the cells of anterior ethmoid sinus were classified into three typies: the result was that type I accounted for 12 sides (27.3%), type II 18 sides (40.9%), type III 14 sides (31.8%) by analysing the data of axial dacryocystographies; the sites of obstruction were connection of the lacrimal sac with nasolacrimal duct, the form of lacrimal sac of 11 patients was normal or enlarged lacrimal sacs, bilateral cricatrized lacrimal sacs were found in one patient by analysing the data of coronary dacryocystographies.
  
  
  CONCLUSIONS
  Computed tomographic dacryocystography preoperatively can provide significant clinical guidance for the endoscopic transnasal dacryocystorhinostomy in locating the site of bone-opening.
authors.affiliation: Department of Otolaryngology, No 414 Hospital, Nanjing Military Medical College, the Second Military Medical University, Nanjing 210015.
authors.forename: Manjie
authors.initials: M
authors.lastname: Jiang
authors.forename: Suqin
authors.initials: S
authors.lastname: Zhang
authors.forename: Zhaoji
authors.initials: Z
authors.lastname: Li
authors.forename: Shuimiao
authors.initials: S
authors.lastname: Zhou
authors.forename: Yingwan
authors.initials: Y
authors.lastname: Liu
authors.forename: Ergui
authors.initials: E
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D003607:Dacryocystitis / Q000000981:diagnostic imaging* / Q000601:surgery; D003608:Dacryocystorhinostomy; D004724:Endoscopy; D005260:Female; D006801:Humans; D007765:Lacrimal Apparatus / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed / Q000379:methods*