synovial chondromatosis

Synovial chondromatosis is a benign condition where numerous cartilaginous nodules form within the soft tissues of a joint, most commonly the knee. This condition, often occurring in young or middle-aged adults, may cause pain or swelling and is typically cured by surgically removing part of the synovial membrane. In some cases, these nodules can also contain bone, leading to a condition called synovial osteochondromatosis. While usually spontaneous, it can sometimes develop secondary to other joint diseases like rheumatoid arthritis or osteoarthritis. The tumor rarely becomes malignant. Osteochondromatosis, also known as hereditary multiple exostosis, is a different disorder affecting children, characterized by bony protrusions on long bones, ribs, and vertebrae.12