Consult with a medical malpractice attorney. They will order the original MRI and the subsequent one, and have them reviewed by an expert. If the expert believes that the original MRI shows a tear, then you may have a case. It is possible that the tear occurred later; that you may have had arthritis in the shoulder which eventually ripped the tendon. It may not have been in that position in the first MRI. Only an expert can give a valid opinion.
Answered on Oct 22nd, 2013 at 12:39 PM