Arthroscopic treatment of synovial chondromatosis, an unusual cause of shoulder pain.

Synovial chondromatosis is a benign idiopathic metaplasia of the synovial membrane. It affects one in 100000 persons. It is 3 times more common in males, arising between 30 and 50 years of age and mainly affects large joints such as the knees (70%), hips (20%) and shoulders (19%). Its etiology is unknown, although it has been associated with chromosomal mutations (p21.3 and 12q13) that affect proteins, Milgram1 described three stages: (1) active disease without intraarticular loose bodies, (2) transitional lesions with synovial proliferation and loose bodies, and (3) loose bodies without synovial disease. The objective of this paper is to review the pathology report of a patient whowas treated arthroscopically.