Also look for common differential diagnoses or worsening factors of shoulder impingement:
*'''Osteoarthritis'''. See severity grading at [[X-ray of osteoarthritis of the shoulder|X-ray of osteoarthritis of the shoulder]]*Presence of any '''calcifications ''' in the supraspinatus tendon, which indicates a differential diagnosis of calcific tendonitis.
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File:X-ray of supraspinatus calcified tendinopathy, labeled.jpg|Calcifications in the supraspinatus tendon.