bicep tendonitis and bone island

I went to the doctor b/c of shoulder pain. I was told I have bicept tendonitis and an x-ray was taken. The doctor told me that she thought I have calcification in my shoulder. Radiologist read my x-ray and says no calcification (normal findings) and that I have a bone island.  I'm waiting to get a referrel to the orthopedic surgeon.  She says the bone island is nothing to worry about, but how do they know it's benign? I'm getting a little worried!!