Clinical and Histopathological Diagnosis of Synovial Pad Proliferation in a Racehorse

Synovial pad proliferation that origins from a soft tissue observes in the fetlock joint of horses, mainly racing horses. In the present study, we report the clinical and histopathological findings of synovial pad proliferation in a 15-years-old male horse with mild lameness. A palpable and visible mass was found at the dorsolateral surface of the right hindlimb joint associated with ulcer and hemorrhage. The radiology examination and biopsy sample were performed for the present case. In radiology, there was not exostosis or a bone fraction. Histopathology dominantly demonstrated densely collagenous, fibrous connective tissue and vascular congestion to gather with mild chronic inflammation and fibrosis. No evidence of edema and acute inflammation were found on the tissue sections. The surgical removal of the proliferative mass was suggested for the treatment of choice for optimal recovery.