Digital Sheath Synovial Ganglion Cysts in Horses.

19:44 EDT 26th March 2015 | BioPortfolio

Summary of "Digital Sheath Synovial Ganglion Cysts in Horses."

Objectives: To report the clinical features of horses with fluid-filled masses associated with the digital flexor tendon sheath (DFTS) and outcome after surgery. Study Design: Case series. Animals: Horses (n=10) Methods: Medical records of horses with fluid-filled masses associated with the DFTS were reviewed and the clinical features, diagnostic methods, treatment, histopathology, and outcome reported. Results: Masses were unilateral (7 hind limb, 3 front limb) and in 8 horses were associated with lameness. In 6 horses, lameness improved by >50% with intrathecal DTFS anesthesia, whereas 2 were less positive but were further improved with perineural anesthesia just proximal to the cyst. Communication between the DFTS and mass was identified in all horses ultrasonographically. Resection of the mass resolved lameness in 7 horses. Histologically (5 specimens), the mass was characterized by a fibrous outer layer without a synovial lining, consistent with a ganglion cyst. Conclusion: The histologic appearance of ganglion cysts suggests that they arise from trauma to the sheath wall and may subsequently be a cause of lameness.


Department of Veterinary Clinical Sciences, Royal Veterinary College, University of London, Hatfield, UK Hong Kong Jockey Club, Hong Kong Willesley Equine Clinic Ltd., Byams Farm, Willesley, Tetbury, UK.

Journal Details

This article was published in the following journal.

Name: Veterinary surgery : VS : the official journal of the American College of Veterinary Surgeons
ISSN: 1532-950X


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Nodular tumor-like lesions or mucoid flesh, arising from tendon sheaths, LIGAMENTS, or JOINT CAPSULE, especially of the hands, wrists, or feet. They are not true cysts as they lack epithelial wall. They are distinguished from SYNOVIAL CYSTS by the lack of communication with a joint cavity or the SYNOVIAL MEMBRANE.

Non-neoplastic tumor-like lesions at joints, developed from the SYNOVIAL MEMBRANE of a joint through the JOINT CAPSULE into the periarticular tissues. They are filled with SYNOVIAL FLUID with a smooth and translucent appearance. A synovial cyst can develop from any joint, but most commonly at the back of the knee, where it is known as POPLITEAL CYST.

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