Presentation
Chronic left shoulder pain
Patient Data
Age: 40
Gender: Female
From the case:
Synovial osteochondromatosis of the shoulder joint
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The left shoulder shows multiple, juxtarticular, rounded calcifications which are similar in size and shape.
From the case:
Synovial osteochondromatosis of the shoulder joint
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Multiple T1 and PD hypointense loose bodies are noted in the subscapular recess/subcoradoid bursa of the glenohumeral joint capsule, as well as within the synovial sheath of the long head of the biceps tendon, consistent with synovial osteochondromatosis.
Mild joint effusion.
Case Discussion
Synovial chondromatosis is a benign condition characterized by synovial proliferation and metaplasia, with development of cartilaginous or osteocartilaginous nodules within a joint, bursa or tendon sheath.
The differential diagnosis of primary synovial chondromatosis includes:
-
pigmented villonodular synovitis (PVNS)
- more confluent masses
- diffuse characteristic low intensity on MRI
- synovial hemangioma
-
lipoma arborescens
- characteristic fat signal/density
-
synovial chondrosarcoma
- soft tissue mass
- extension beyond the joint
- presence of metastases
- siderotic synovitis
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