Ossifying Fibroma in the Nasal Cavity of a 2-Year-Old Horse

Abstract

A 2-year-old mare of an unknown breed was referred to the clinic due to undetermined breathing difficulties. Physical examination revealed painless swelling rostral to the nasoincisive notch and a large, firm mass protruding from the left nostril. Radiographic examination of the head revealed a mass occupying the left nasal cavity and a displaced and hypoplastic last premolar of the left maxilla. The CT scan showed a well-demarcated heterogeneous mass measuring 22 × 9 × 5 cm (length × height × width) in the left nasal cavity attached to the roots of the displaced tooth and conchae. The surgery was performed on the standing horse. Firstly, due to the oblique position of the displaced tooth, the extraction was performed extra-orally through the trephination and repulsion of the maxillary bone. In the next step, a direct surgical approach was chosen for the caudal part of the mass via the osteotomy of the left nasal bone. The mass was bluntly separated from the conchae and removed through the nostril using Fergusson forceps. The histopathological characteristics of the mass led to the diagnosis of ossifying fibroma. The horse recovered completely in seven months, without recurrence after two years.

Computed tomographic characteristics of frontal sinus ossifying fibroma in a dog

“…8,18,19 The CT features of sinonasal ossifying fibromas in horses are similar to those already described: large, expansile, heterogeneous mass with well-defined margins, variable degrees of ossification and internal zones of calcification, and often with associated bone thinning or lysis. 6,12,13,21 Poorly defined margins were reported in one case; however, a complete radiological description was not provided. 9 The CT findings in the current case were important for surgical planning, consistent with previous reports.…”

“…7,11 Clinical signs in people include nasal obstruction, rhinorrhea, epistaxis, facial swelling, proptosis, vision impairment, and headache. 7,8 Horses may present with chronic nasal discharge, facial deformity, respiratory distress, 6,12 and rarely blindness. 13 In this current case, the dog had chronic left-sided nasal discharge.…”