Did your "Specialist" actually discuss the dehiscence finding with you, or failing that refer you on to someone who would understand it? It was sitting there, waiting for him to explain it which is why we have diagnostic tests (with special mention of the CT scan, which carries its own set of significant radiation risks). If he didn't address it then he has taken your money and not provided a service, and you have been irradiated for no good reason (unless you can get someone else to review the CT).