bone, joint, and muscle disorders
Joint Tumors
Introduction
Tumors rarely affect joints unless a bone tumor or soft-tissue tumor is near a joint. However, two conditions—synovial chondromatosis and tenosynovial giant cell tumors—occur in the lining (synovium) of joints. These tumors are noncancerous (benign) but can cause severe damage to the joint. Both conditions usually affect one joint, most often the knee or the hip, and can cause pain and a buildup of fluid. To diagnose these conditions, doctors do X-rays , Treatment for both requires surgical removal of the abnormal synovium (called synovectomy). (See also Overview of Bone Tumors .) 