Gadolinium containing arthrogram injectate within the subacromial-subdeltoid bursa will have a pronounced appearance on MR arthrography, due to the intentionally performed T1 fat-saturated sequences. 

Arthrogram injectate within the subacromial-subdeltoid bursa will occur more commonly due to a full-thickness rotator cuff tear, leading to decompression of the arthrogram injectate into the bursa.  Less commonly is the iatrogenic injection into the subacromial-subdeltoid bursa.