synovioma

Synovioma, also known as synovial sarcoma, is a malignant tumor that originates in the tissues surrounding joints, such as the capsule, tendon sheaths, bursas, fasciae, and intermuscular septa. It rarely occurs within the joint itself. These tumors are most common in adolescents and young adults, with a higher incidence in the legs compared to the arms.1

Synoviomas spread locally and can metastasize to regional lymph nodes and lungs. Treatment typically involves radical excision, which may include amputation, as the tumors are not highly responsive to X-rays, and drug therapy has been ineffective.1

In contrast, synovitis refers to the inflammation of a synovial membrane, which is a component of synovial joints. Synovial joints, like ball-and-socket joints, are characterized by the presence of fluid and allow for movement.23