Synovial osteochondromatosis

Case contributed by Abdallah Al Khateeb
Diagnosis almost certain

Presentation

Long-standing knee pain and swelling and limitation of movement.

Patient Data

Age: 20 years
Gender: Male
mri

There are numerous similar-sized intra-articular loose bodies of variable signal intensity, some of them are showing intermediate to high signal intensity that is of cartilage.  Others have low signal intensity at the periphery, which represents ossification.

The joint capsule is distended with a little fluid and these numerous loose bodies.

No significant degenerative changes of the joint.

Case Discussion

The findings mentioned involved in this case are typical of synovial chondromatosis. In view of the patient's age and the absence of severe degenerative process of the joint, primary synovial chondromatosis is preferred over the secondary counterpart which is a related to a degenerative process.

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