title: Reconstruction of acquired nasolacrimal duct obstruction.
abstract: BACKGROUND
  Acquired nasolacrimal duct obstruction is a common condition in patients who visit otolaryngologists and ophthalmologists. These patients often complain of epiphora and blurred vision, and sometimes they suffer from acute or chronic dacryocystitis. Other causes of acquired nasolacrimal duct obstruction include trauma, chronic inflammation, post-operative iatrogenic procedures, and tumors. Reconstruction of an acquired nasolacrimal duct obstruction provides great improvement in a patient's quality of life and satisfaction both functionally and cosmetically. In this paper, we report on surgical techniques of endonasal endoscopic dacryocystorhinostomy and traditional external dacryocystorhinostomy. A rare case of mechanical compression of the lacrimal sac by a frontal mucocele is also presented.
  
  
  METHODS
  From 1989 through 1999, we treated 26 patients, 10 men and 16 women, with 28 cases of acquired nasolacrimal duct obstruction. Two patients had bilateral involvement. Five cases were complications of sinus surgery. Ten cases were acute dacryocystitis due to chronic nasolacrimal duct obstruction. One case of nasolacrimal duct obstruction was caused by a frontal mucocele. The remaining cases were non-specific nasolacrimal duct obstruction. Of all patients, 26 cases underwent external dacryocystorhinostomy, 1 underwent endonasal endoscopic dacryocystorhinostomy, and 1 case underwent frontal sinus dacryocystorhinostomy.
  
  
  RESULTS
  Only 1 patient out of 28 cases that underwent surgery suffered from obstruction after external dacryocystorhinostomy for 3 months; 25 patients attained both anatomical success and clinical improvement.
  
  
  CONCLUSIONS
  The success rates were high for patients undergoing either traditional external dacryocystorhinostomy or endonasal endoscopic dacryocystorhinostomy.
authors.affiliation: Department of Otolaryngology, Chang Gung Memorial Hospital, 123, Tao-Pei Road, Niaosung, Kaohsiung, Taiwan, R.O.C.
authors.forename: C C
authors.initials: CC
authors.lastname: Hsieh
authors.forename: C L
authors.initials: CL
authors.lastname: Hung
authors.forename: C Y
authors.initials: CY
authors.lastname: Su
mesh_terms: D003608:Dacryocystorhinostomy; D004724:Endoscopy; D005260:Female; D006801:Humans; D008297:Male