“…[5][6][7] They are described more in humans, and to a lesser extent horses, especially in young horses, with mandibular involvement most common in both. [8][9][10] Sinonasal ossifying fibromas are uncommon, and in people, often incidental findings on imaging examinations. 7,11 Clinical signs in people include nasal obstruction, rhinorrhea, epistaxis, facial swelling, proptosis, vision impairment, and headache.…”