Fluoroscopically guided neocanalization for treatment of nasolacrimal atresia in two horses.

This study discusses the use of fluoroscopically guided neocanalization in the treatment of nasolacrimal duct atresia in two horses. The procedure was successful in relieving the conditions in both cases, suggesting potential as a viable alternative to traditional surgical procedures.

Objective of the Study

• The research was conducted to evaluate the effectiveness of fluoroscopically guided neocanalization as a treatment method for nasolacrimal duct atresia in horses. Two subjects, a Thoroughbred stallion and a Saddlebred mare, displaying nasal ocular discharge were utilized for this study.

Methodology

• Both horses, one showing clinical abnormalities only on the right side and the other bilaterally, were assessed through a physical examination. The symptoms included copious yellow-tan mucoid ocular discharge and an absent nasal punctum. Anterograde nasolacrimal duct irrigation did not show successful results, and the Jones I test was negative.
• A computer tomography (CT) scan with contrast was used to confirm the nasolacrimal duct atresia in both horses. The scans revealed that the nasolacrimal ducts were blocked.
• Under general anesthesia, the affected nasolacrimal duct was catheterized anterograde, and the contrast was injected.
• Fluoroscopic guidance, an imaging technique that utilizes x-rays to obtain real-time moving images, was used to achieve retrograde access to the distal nasolacrimal duct. The process provided through-and-through wire access.
• The stoma was then dilated and a temporary stent placed for 4-8 weeks. The stent served as a conduit for draining the mucoid ocular discharge and achieving restoration of the nasolacrimal duct.

Results

• Following the procedure, both horses were comfortable and free of the mucoid ocular discharge at the last follow-up check nine months postoperatively.

Conclusion

• The study concluded that fluoroscopically guided neocanalization could be a viable alternative to traditional surgical methods for treating nasolacrimal duct atresia, especially when access to the site of obstruction is limited.