Tenosynovial Chondromatosis in Finger, Mimicking Neoplastic Lesion

Tenosynovial chondromatosis is an extremely rare, extra-articular variant of synovial chondromatosis. It is often mistakenly considered a cartilage or soft tissue tumor. This condition primarily affects the tendon sheath, commonly in the hands or feet. It typically presents as a gradually enlarging soft tissue mass that may be painful or restrict joint movement. In its early stages, plain radiographs may not show any abnormalities. This report discusses a case featuring a multinodular proliferation of cartilage, bone erosion, and a periosteal reaction located deep in the flexor tendons of the index finger.