Proliferative tenosynovitis in Brazilian Mangalarga Marchador horses

Proliferative tenosynovitis (PT) is an inflammatory and proliferative disorder of the synovial membrane of the tendon sheath that is rare in animals. The histological alterations are characterized by multinodular neovascularization, with infiltration of histiocytic and multinucleated giant cells and...

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Bibliographic Details
Published in:Journal of comparative pathology 2023-04, Vol.202, p.8-15
Main Authors: Daoualibi, Yasmin, Pereira, Asheley H.B., Lima, Leonardo R., Pool, Roy R., Ubiali, Daniel G.
Format: Article
Language:English
Subjects:
Animals
Brazil
horse
Horse Diseases - pathology
Horses
joint disease
lameness
Lameness, Animal - pathology
Lameness, Animal - surgery
Mangalarga Marchador
synovial membrane
Tendons
tenosynovitis
Tenosynovitis - diagnosis
Tenosynovitis - pathology
Tenosynovitis - veterinary
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Summary:Proliferative tenosynovitis (PT) is an inflammatory and proliferative disorder of the synovial membrane of the tendon sheath that is rare in animals. The histological alterations are characterized by multinodular neovascularization, with infiltration of histiocytic and multinucleated giant cells and haemosiderin deposition. We reviewed necropsy and biopsy records of horses submitted to the Setor de Anatomia Patológica of the Universidade Federal Rural do Rio de Janeiro from January 2017 to December 2020 to select cases of PT. We identified PT in three adult Brazilian Mangalarga Marchador horses with nodular lesions on the metacarpophalangeal, metatarsophalangeal or carpal joints. The three horses were under 6 years of age and presented with lameness and pain on palpation. There were recurrences in two horses after surgical removal. Radiographic and ultrasound examinations detected masses in the flexor or extensor tendons and subtendinous bursa. Histological study of synovial membrane and tendon sheath revealed an increased number of vessels, fibroplasia, osseous metaplasia and infiltration of lymphocytes, plasma cells and siderophages. This is the first description of PT in horses, which should be included as an orthopaedic differential diagnosis, especially in Mangalarga Marchador horses with lameness.
ISSN:0021-9975
1532-3129
DOI:10.1016/j.jcpa.2023.03.002