Hi @lewisandmabel and welcome. I wouldn't doubt that the radiation you had caused internal injuries which later pop up to cause other issues. It is also possible that you had a TIA for other reasons as these can happen to anyone for a variety of reasons. I understand your concern about the possibility of a full blown stroke. If I were you I wouldn't allow for an inconclusive diagnosis. Would the doctor consider an inconclusive payment for services? Does the doctor wish to wait for the autopsy results to get a conclusive diagnosis? These are the questions I wouldn't hesitate to ask. It is your life. I wish you well and I hope others can jump in on this with better insight than I have.