Pancarpal synovial and tenosynovial chondromatosis in a 65-year-old man: a highly unusual presentation of a common condition.

Synovial chondromatosis is a rare, benign, metaplastic condition in which synovial tissue becomes hyperplastic, and foci of cartilaginous metaplasia develop in the synovial membranes of joints, bursae, or tendon sheaths. Involvement is most commonly monoarticular. The large joints are most commonly affected, with the knee accounting for more than half of all cases. There are isolated reports of synovial chondromatosis occurring in the small joints of the wrist and hand. However, it is very uncommon for the disease to involve multiple different synovial structures. We report the case of a middle-aged man with pancarpal synovial chondromatosis with involvement of numerous bony, articular, and tenosynovial structures within the hand and wrist.