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33rd Annual Scientific Meeting proceedings

Stream:   |   Session:
Date/Time: 30-11--0001 (00:00 - 00:00)   |   Location:
Treatment of equine mandibular aneurysmal bone cysts with ß-tricalcium phosphate
Spoormakers TJP*1, Heim C*2, Vermunt L3, Fürst A*2, Rovel T4
1Department of Clinical Sciences, Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands, 2Equine Department, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland, 3Department of Clinical Sciences, Division of Anatomy and Physiology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands, 4Department of Clinical Sciences, Division of Diagnostic Imaging, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands.

Objective: Mandibular aneurysmal bone cysts (ABCs) are rare in horses but can have severe clinical implications. Massive swelling, deformation and changes to dental structures can necessitate treatment. The aim was to study the use of ß-tricalcium phosphate (ß-TCP) in equine mandibular ABCs.

Study Design: A multicentre prospective clinical study of surgical treatment of ABCs consisting of debridement and filling with ß-TCP.

Animals: 3 adult horses (1 Dutch Warmblood, 1 Icelandic, 1 Standardbred) and 1 yearling Polo pony with histologically confirmed ABCs of the mandible.

Methods: After clinical, radiographic and computed tomographic evaluation surgery was performed under general anaesthesia (n= 3) or standing (n=1). ABCs were opened, debrided, flushed, and filled with ß-TCP only (n=1), or ß-TCP in combination with autologous bone marrow (n=3).

Results: In the adult cases, the ABCs healed uneventfully. After surgery, clinical examination, available radiographs, and CT examinations showed an uneventful reduction in size with an increase in opacity/ attenuation of the ABC. In the juvenile case, a surgical site infection occurred. After removal of ß-TCP remnants, the ABC healed satisfactorily. Persisting dental abnormalities necessitated dietary adjustments to maintain an acceptable body condition score in the pony.

Conclusion: The outcome of surgical treatment of ABCs and filling with ß-TCP is favourable in this population. In juvenile patients with abnormal dental development additional dental and dietary care should be considered.

Clinical Significance: In young specimen, surgery might be more urgent as expansile ABCs interfere with teeth development and this could affect functionality of the involved dental quadrant.

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