Intraosseous migration of supraspinatus tendinous calcification
Severe shoulder pain without trauma.
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Calcification in the supraspinatus tendon partly migrated to the subacromial synovial bursa with chemical bursitis, and partly into the humeral trochitis where is observed adjacent medullary edema.
The deposition of calcium hydroxyapatite crystal causes acute pain when the calcifications dissolve and migrate into the subacromial bursa and adjacent soft tissue. Sometimes calcium penetrates the bone, the most common site is the greater tubercle of the humerus.