PMC7276592_01
Anteroposterior radiograph shows no calcified lesion in the right shoulder.
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F1
Plain radiographs of the right shoulder showed no abnormal findings (Fig. 1), but computed tomography (CT) and magnetic resonance imaging (MRI) showed several loose bodies in the axillary pouch and a large calcified mass lesion in the subscapular bursa (Fig. 2 and 3).
Arthroscopic view from the posterior portal shows free bodies in the axillary pouch (b), the sublabral foramen (arrows) at the anterosuperior portion of the glenoid (a), and multiplelarge calcified mass lesions and intrasynovial chondroid nodules in the subscapular bursa (c).
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F4
Arthroscopic examination showed several loose bodies in the glenohumeral joint (Fig. 4a). A sublabral foramen was found at the anterosuperior portion of the glenoid that communicated with the subscapular bursa (Fig. 4b). Multiple large calcified mass lesions and intrasynovial chondroid nodules were seen in the subscapular bursa, suggesting Milgram Stage 2 (transitional phase) (Fig. 4c).
Macroscopic appearance of numerous cartilaginous loose bodies removed from the subscapular bursa (a).Photomicrograph of loose bodies shows multiple lobulated cartilaginous nodules within the synovial tissue (b).
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F5
The histological examination of the loose bodies confirmed cartilaginous synovial metaplasia consistent with primary synovial chondromatosis (Fig. 5).