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Equine Articular Synovial Cysts: 16 Cases

Authors

  • Mathieu Lacourt DVM,

    1. Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Canada
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  • Melinda MacDonald DVM, PhD, Diplomate ACVS,

    1. Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, CA
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  • Yves Rossier DVM, Diplomate ACVIM,

    1. Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Canada
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  • Sheila Laverty MVB, Diplomate ACVS & ECVS

    Corresponding author
    • Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Canada
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Corresponding Author

Sheila Laverty, MVB, Département de sciences cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, C.P. 5000, Saint-Hyacinthe, Quebec J2S 7C6, Canada

E-mail: sheila.laverty@umontreal.ca

Abstract

Objective

To report the clinical findings, diagnosis, treatment and outcome of equine patients with articular synovial cysts.

Study Design

Retrospective case series.

Animals

Horses (n = 16) with articular synovial cysts.

Methods

Horses diagnosed with articular synovial cysts (1988–2009) at 2 veterinary teaching hospitals were studied. Signalment, history, clinical signs, diagnostic methods and treatment were retrieved and telephone follow-up was obtained.

Results

Sixteen horses with articular synovial cysts were identified. Lameness was the reason for referral in most (n = 9) horses. Diagnosis was based on a combination of palpation and imaging studies, including radiography, ultrasonography and/or arthrography. Excision of the cyst was performed in 8 horses. Outcome was available for 4 surgically and 2 conservatively treated horses. Lameness resolved in 3 horses treated surgically and the 4th died for unrelated reasons. The 2 conservatively treated horses performed satisfactorily for the rest of their career.

Conclusions

Equine articular synovial cysts are rare and can be associated with lameness. The cysts had a synovial lining in all horses where it was assessed. Surgical excision may be successful in resolving the lameness and allowing selected horses to return to work.

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