title: Radiotherapy of a recurrent ossifying fibroma in the paranasal sinuses of a horse.
abstract: A 7-year-old female Thoroughbred was admitted with a history of labored breathing, stridor, and exercise intolerance. Examination revealed a mass in the left paranasal sinuses that was determined to be an ossifying fibroma. Initial treatment consisted of surgical removal of the mass alone; however, the mass recurred 9 months after surgery. The mass was again removed, and adjunctive radiotherapy consisting of 3,000 cGy of cobalt radiation was administered. This time, the tumor did not recur for > 6 years. A third surgery was performed to remove the mass, and adjunctive radiotherapy consisting of 4,000 cGy of photon beam radiation from a linear accelerator was administered. The mass did not recur during the subsequent 3 years. Ossifying fibromas are uncommon tumors that frequently recur if incompletely excised. Results in this horse suggest that adjunctive radiotherapy may delay or prevent tumor recurrence in affected horses.
authors.affiliation: Department of Clinical Studies-New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348, USA.
authors.forename: James A
authors.initials: JA
authors.lastname: Orsini
authors.forename: Debra K
authors.initials: DK
authors.lastname: Baird
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Ruggles
mesh_terms: D000818:Animals; D005260:Female; D018214:Fibroma, Ossifying / Q000532:radiotherapy / Q000601:surgery / Q000662:veterinary*; D006734:Horse Diseases / Q000532:radiotherapy* / Q000601:surgery; D006736:Horses; D009364:Neoplasm Recurrence, Local / Q000532:radiotherapy / Q000601:surgery / Q000662:veterinary; D010255:Paranasal Sinus Neoplasms / Q000532:radiotherapy / Q000601:surgery / Q000662:veterinary*; D016896:Treatment Outcome