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===Primary neoplasia===
[[Image:Human synovial sarcoma.jpg|right|thumb|100px|<small><center>Human synovial sarcoma (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]
*Rare
*Synoviomas
*Synoviosarcomas
*Mass must have connection with the joints to be diagnosed as such
===Extension neoplasia===
*From nearby osteosarcomas and marrow tumours
===Metastatic neoplasia===
*Occasionally from lymphosarcoma, carcinoma of prostate and mammary glands - may extend to lumbar vertebrae from regional (dorsolumbar) lymph nodes
===Ganglion cysts===
*Usually in close proximity to joints and tendon sheaths
*Extremely rare in veterinary medicine c.f. humans
*No consensus as to genesis
*Cysts contain mucinous/yellow fluid
*[[More on Ganglion cysts|More about ganglion cysts]]