Primary synovial osteochondromatosis

Case contributed by Ammar Haouimi
Diagnosis almost certain

Presentation

Painful right shoulder.

Patient Data

Age: 16 years

The CT scan demonstrates multiple small calcific loose bodies of uniform size within the glenohumeral joint, axillary recess, subacromial/subdeltoid bursa as well as the subscapular bursa and the biceps tendon sheath. Irregular destruction of the posterolateral aspect of the humeral epiphysis containing chondroid calcifications. Irregular cortical erosions of the glenoid cavity are also noted. No evidence of osteoarthritic changes.

Case Discussion

The patient age, clinical presentation and CT features are most consistent with a primary synovial osteochondromatosis.

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