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There is extensive calcification within the subacromial space which is homogenously dense and amorphous in shape. The humeral head is displaced inferolaterally with a widened glenohumeral joint space and acromiohumeral distance, likely due to effusion.
It is unclear whether this calcification is intratendinous with a large underlying gelnohumeral joint effusion, or in the subacromial bursa above the supraspinatus inciting an intense inflammatory reaction and bursitis, subluxating the humeral head.