I have been having flank pain for three months, first I thought bit was pleurisy and did a course of prednisone but my lungs are clear, no rubbing etc. Then I saw a spine surgeon who did a MRI and said my spine was fine, a touch of arthritis in my cervical spine. Today I had a MRI with contrast of my brain and cervical spine. The Dr suspects , arthritis, MS or fibromyalgia ...I did have open heart surgery 20 years ago. Now I am suspecting costochondritis...any thoughts?