Canaliculosinostomy as a Long-Term Treatment of Seven Horses for Permanent Obstruction of the Nasolacrimal Duct.

OBJECTIVE: To describe canaliculosinostomy performed to resolve epiphora caused by nasolacrimal duct obstruction and to report the outcome of horses undergoing this procedure. STUDY
DESIGN: Case series. ANIMALS: Seven horses with uni- or bilateral nasolacrimal duct obstruction.
METHODS: The ventral lacrimal punctum and canaliculus were expanded with catheters of increasing diameter until a 14 gauge, Jamshedi needle could be passed into and through the lacrimal sac into the caudal maxillary sinus. One end of a plastic tube was inserted through the needle into the sinus, and the needle was withdrawn over the tubing. Using a hubless needle, the other end of the tube was passed through the lower eyelid leaving a segment of tubing exposed ventral to the eyelid. The end of the tubing within the sinus was exteriorized through a trephine hole in the frontal sinus and then tunneled beneath the skin adjacent to the osteotomy using a hubless needle, leaving a segment of tubing exposed on the forehead. Exposed tubing was sutured to the skin. The tubing was removed at 5-6 weeks.
RESULTS: Canaliculosinostomy was easily performed with the horses sedated. Five horses had resolution of epiphora, and 2 had improvement.
CONCLUSION: Canaliculosinostomy to divert lacrimal secretions into the sinuses resolves or improves epiphora caused by nasolacrimal duct obstruction and provides a good functional and cosmetic outcome. Canaliculosinostomy can be performed in the sedated horse. © Copyright 2015 by The American College of Veterinary Surgeons.