Three cases of osteoma and an osseous fibroma of the paranasal sinuses of horses in South Africa

Ingrid Cilliers, J. Williams, A. Carstens, N. M. Duncan

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Four horses were presented to the Onderstepoort Veterinary Academic Hospital with histories of facial asymmetry, nasal discharge or obstruction of normal nasal passage airflow. Radiographic examination of the maxillary sinuses of 2 cases revealed well circumscribed, unilateral, mineralised masses; the other 2 cases showed less mineralisation. The masses were accessed for further investigation by surgically created frontonasal bone flaps or trephination of the maxillary sinuses. Diagnosis of osteoma was confirmed histopathologically in 3 of the cases and of ossifying fibroma in the 4th. Two horses were euthanased directly after surgical intervention due to poor prognosis. Osteomas are by nature expansile tumours and follow the complex communication of the sinuses, and therefore are not all amenable to surgical removal. Osseous fibromas are large, solitary, expansile lesions that are rare in all species but reported most frequently in horses. They have an apparent predilection for the rostral mandible of the horse.

Original languageEnglish
Pages (from-to)185-193
Number of pages9
JournalJournal of the South African Veterinary Association
Issue number4
Publication statusPublished - Dec 2008


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