List DD of supraspinatus tear
Intratendinous cyst, supraspinatus tendinopathy, calcific tendinitis
What are the types of partial supraspinatus tear?
Articular surface type which is the most common and the tear faces the glenohumeral joint Bursal surface type which faces the subacromial bursa. Interstitial type which lies within the tendon substance and cannot be seen in arthrography
The supraspinatus tendon is thickened displaying intermediate signal in T1 and fluid signal within its substance in T2 and STIR images. No retraction. Mild fluid is seen within the subacromial subdeltoid bursa. Associated hypertrophic osteoarthropathy of the acromioclavicular joint is seen obliterating the subacromial fat and impinging the supraspinatus tendon.
Subcoracoid bursitis.
Degenerative subchondral humeral head cyst