60 year old female presented with a 1-week history of pain and restricted movements of the right shoulder. MRI of right shoulder joint was requested with suspicion of rotator cuff tear. 

MRI showed thickened and edematous subscapularis tendon with amorphous intratendinous calcification, consistent with calcific tendonitis. Limited CT sections confirmed the calcific deposits. The calcific deposits showed varying densities. No extratendinous extension of the calcification noted.

Calcific tendonitis of rotator cuff muscles most commonly affects supraspinatus tendon followed by infraspinatus and subscapularis tendons. 

Calcific deposits can extend into adjacent bursae and soft tissues causing bursal or periarticular inflammation.