Nasolacrimal duct: obstruction - acquired in Horses (Equis) | Vetlexicon
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Nasolacrimal duct: obstruction – acquired

ISSN 2398-2977

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Introduction

  • Cause: stenosis and/or occlusion of the nasolacrimal duct (NLD) system can be a complication of inflammatory, infectious, neoplastic or traumatic disease processes within, or external to, the system.
  • Signs: epiphora and/or ocular discharge plus those related to the primary disease process.
  • Diagnosis: aided by NLD flushing and catheterization.
  • Treatment: of primary cause is essential plus NLD cannulation and flushing with antibiotic/corticosteroid solutions.
  • Prognosis: dependent upon primary cause.

Presenting signs

  • Depends upon specific primary cause.
  • Watery ocular discharge becoming purulent with time.
  • Uni-/bi-lateral epiphora and ocular discharge   Eye: ocular discharge  .

Geographic incidence

Age predisposition

  • Middle and old aged.
  • Young.

Breed/Species predisposition

Cost considerations

  • Treatment of primary problem may include surgery.
  • Treatment of NLD obstruction.

Special risks

Pathogenesis

Etiology

Internal

External

Pathophysiology

  • Stenosis and/or occlusion of the nasolacrimal duct system may occur as an acquired complication of various disease processes within the drainage system or external to it.
  • The NLD system is particularly exposed to internal and external sources of obstruction due to:
    • Its anatomy - close proximity to facial bones and paranasal sinuses, narrow lumen and tortuosity.
    • Its function as a drainage conduit for the eye allowing concentration of bacteria, debris and other agents.
    • Its connection with the ocular and respiratory systems allowing two potential sources of contamination.

Diagnosis

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Treatment

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Prevention

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • McIlnay T R, Miller S M & Dugan S J (2001) Use of canaliculorhinostomy for repair of nasolacrimal duct obstruction in a horse. JAVMA 218 (8), 1323-1324 PubMed.
  • Moore C P (1992) Eyelid and nasolacrimal disease. Vet Clin North Am Equine Pract (3), 499-519 PubMed.