Poore, Luke AlexanderLe Roux, ChristelleCarstens, Ann2019-12-042019-12-042019-09-26Poore, L.A., Le Roux, C. & Carstens, A., 2019, ‘Traumainduced exostosis of multiple suture lines causing partial bilateral nasolacrimal duct obstruction in a 7-year-old Thoroughbred mare’, Journal of the South African Veterinary Association 90(0), a1764. https://DOI.org/10.4102/jsava.v90i0.1764.1019-9128 (print)2224-9435 (online)10.4102/jsava.v90i0.1764http://hdl.handle.net/2263/72503A definitive diagnosis of extensive suture line exostoses affecting the nasofrontal, nasolacrimal, nasomaxillary, frontolacrimal, lacrimozygomatic and lacrimomaxillary suture lines in a 7-year-old Thoroughbred mare with chronic bilateral epiphora and facial deformation was achieved using standing computed tomography (CT) examinations. Positive contrast dacryocystorhinography using CT revealed partial bilateral obstruction of the nasolacrimal ducts. Minimally displaced depression fractures of the right nasal bone, the right maxillary bone and right frontal bone were also demonstrated. The cosmetic appearance of the periosteal reaction associated with the suture line exostosis and epiphora significantly improved within 3 months of diagnosis and treatment.en© 2019. The Authors. Licensee: AOSIS. This work is licensed under the Creative Commons Attribution License.TraumaComputed tomographyExostosisSuture linesHorse (Equus caballus)Thoroughbred horseEquine sinonasal diseaseNasal sinus regionParanasal sinus regionComputed tomography (CT)Radiographic examinationCanaliculosinostomyArticle