title: Nasolacrimal tuberculosis in a patient with conjunctivodacryocystorhinostomy.
abstract: OBJECTIVE
  To present an unusual case of nasolacrimal tuberculosis that was diagnosed with polymerase chain reaction (PCR) and to discuss the role of PCR as a diagnostic aid.
  
  
  METHODS
  Case presentation with diagnostic modalities including PCR, cytopathologic, and histopathologic examinations with special stains.
  
  
  RESULTS
  A 40-year-old woman with bilateral lacrimal drainage system obstruction underwent a right dacryocystorhinostomy with stents and left conjunctivodacryocystorhinostomy with Jones bypass tube. Although the findings of direct and endoscopic examinations of the nasal cavity were within normal limits, the tissue removed during surgery from the middle turbinate revealed caseating granulomatous lesions on histopathologic examination. Acid-fast organisms were demonstrated in postoperative nasal washings, and Mycobacterium tuberculosis infection was confirmed with PCR.
  
  
  CONCLUSIONS
  Primary tuberculosis of the nasolacrimal mucosa is rare, and its occurrence without any symptoms, as in this patient, is even less frequent. The most interesting aspect of this case was the identification of the M. tuberculosis DNA in the mucosa of anterior turbinate and fibrous tissue within the previous surgical site. Histopathologically, the presence of caseating granulomas was seen only in the nasal mucosa, indicating that PCR may be of use in identifying the causative organism even in the absence of typical histopathologic features.
authors.affiliation: Department of Ophthalmology, Riyadh Military Hospital, Saudi Arabia.
authors.forename: A F
authors.initials: AF
authors.lastname: Al-Malki
authors.forename: T M
authors.initials: TM
authors.lastname: Issa
authors.forename: F
authors.initials: F
authors.lastname: Riley
authors.forename: Z A
authors.initials: ZA
authors.lastname: Karcioglu
mesh_terms: D000328:Adult; D003228:Conjunctiva / Q000601:surgery*; D017931:DNA Primers / Q000737:chemistry; D004269:DNA, Bacterial / Q000032:analysis; D003608:Dacryocystorhinostomy; D005260:Female; D006801:Humans; D007766:Lacrimal Apparatus Diseases / Q000175:diagnosis* / Q000382:microbiology / Q000601:surgery; D009169:Mycobacterium tuberculosis / Q000235:genetics / Q000302:isolation & purification; D009301:Nasolacrimal Duct / Q000382:microbiology / Q000473:pathology* / Q000601:surgery; D016133:Polymerase Chain Reaction; D014057:Tomography, X-Ray Computed; D014392:Tuberculosis, Ocular / Q000175:diagnosis* / Q000382:microbiology / Q000601:surgery
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial