Fibro‐Osseous Lesions Of The Craniofacial Complex In Horses: 30 Cases (2001‐2019)

Abstract

Objective: To describe the presentation, diagnosis, treatment, and outcome for horses with fibro-osseous lesions of the craniofacial complex. Study design: Retrospective multicenter case series. Animals: Thirty horses evaluated for fibro-osseous lesions of the skull from January 1, 2001 through December 31, 2019 in four centers. Methods: Medical records were reviewed for signalment, clinical presentation, histological and diagnostic imaging findings, treatment instituted, and outcome. Long-term outcome information was obtained by owner questionnaire or the medical record. Results: Diagnoses included ossifying fibroma in 20 of 30 horses, osteoma in eight of 30 horses, and fibrous dysplasia in two of 30 horses. Twelve of 30 lesions were diagnosed in horses <1 year old, and 20 of 30 lesions originated from the rostral mandible. The most common treatment was rostral mandibulectomy. Recurrence was not reported after complete excision. Incomplete excision was confirmed in eight horses (four ossifying fibromas, three osteomas, and one fibrous dysplasia), and follow-up information was available for seven horses. Recurrence occurred in one horse, while six horses had long-term resolution of clinical signs. Prognosis for survival and return to use was excellent in 23 horses with longterm follow-up. Conclusion: Fibro-osseous lesions were uncommon in this multicenter study; they were most commonly diagnosed in young animals and most frequently affected the rostral mandible. Long-term survival was excellent. Clinical significance: The definitive diagnosis of fibro-osseous lesions of the craniofacial complex in horses is made from results of histopathology and cannot be determined on the basis of clinical presentation alone. Surgical excision

Computed tomographic characteristics of frontal sinus ossifying fibroma in a dog

“…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. 6 Complete surgical resection is the treatment of choice, to prevent recurrence.…”

“…Radiation therapy is an additional treatment option that may be considered in cases of ossifying fibroma that cannot be completely surgically resected. 1,9 In conclusion, this is the first published report of frontal sinus ossifying fibroma in a dog and demonstrates how CT can aid in the diagnosis and surgical planning of such a case. Ossifying fibromas of the frontal sinus in dogs may appear as a clearly defined, lobulated, heterogeneously mineralized mass.…”

“…6 Complete surgical resection is the treatment of choice, to prevent recurrence. 4,5,9,19 This was not possible in this current case, as the mass was involving the cribriform plate.…”

“…[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.…”

“…Ossifying fibromas are slow‐growing, expansile masses that are often clinically silent until they grow to a size that causes distortion, compression, or occlusion of adjacent structures 5–7 . They are described more in humans, and to a lesser extent horses, especially in young horses, with mandibular involvement most common in both 8–10 . Sinonasal ossifying fibromas are uncommon, and in people, often incidental findings on imaging examinations 7,11 .…”