I understand that you are impatient and want to know what the hell this is. I would too. But try to stay calm, it might just be an artifact on the image. You know that these machines don't really take photos, the imagies are calculated from a lot of data before presented as a series of photos. So errors do occur. Whatever it is there is little point in worrying. Easier said than done maybe. But wait for the MRI and let the doctors decide what this might be. It might be nothing.