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Type A synoviocytes are histiocytes of bone marrow origin that are immunoreactive with antibodies against typical markers of histiocyte origin, such as CD18, Iba-1, and CD204. Certain breeds and dogs with previous injury to a joint, especially cranial cruciate ligament rupture, are predisposed to synovial histiocytic sarcoma. Type B synoviocytes are mesenchymal cells that produce synovial fluid. There are no specific markers of type B synoviocytes, but based on their gross and microscopic appearance, synovial myxosarcomas (previously considered synovial myxomas) are presumed to be of type B synoviocyte origin. These can infiltrate into surrounding tissues, but are slow-growing and rarely metastasize, and then only to regional lymph nodes. Synovial histiocytic sarcomas and myxosarcomas can cause lysis in multiple bones surrounding the joint, but they have different prognoses and require histopathology and sometimes immunohistochemistry to diagnose them. Synovial sarcoma and synovial cell sarcoma are terms used in the human medical literature for a tumor that is not of synovial origin; these terms should not be used in veterinary medicine.<\/jats:p>","DOI":"10.1177\/03009858241265005","type":"journal-article","created":{"date-parts":[[2024,7,28]],"date-time":"2024-07-28T02:52:00Z","timestamp":1722135120000},"page":"13-19","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":7,"title":["Sarcomas of synovial origin in dogs: An updated review"],"prefix":"10.1177","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0013-7544","authenticated-orcid":false,"given":"Linden E.","family":"Craig","sequence":"first","affiliation":[{"name":"University of Tennessee, Knoxville, 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