I work in radiology. I currently work in an outpatient clinic but have previously worked in a hospital. I do transcription and coding now, but have also worked as a radiology assistant in CT, MRI, and interventional radiology.
In my experience, the referring physician's name--the doctor who ORDERED THE EXAM--is at the top of the order and also appears in the salutation ("Dear Dr. So-and-so") at the top of the page. Even if the patient specifies that another physician is to give her the results of the exam, the ORDERING physician's name appears at the top of the page, and any physicians to be copied in are listed at the bottom. This is true for ANY sort of radiological exam.
If your insurance company was billed for the CXR, the EOB will likely show the radiologist's name, not the ordering physician's name. However, when the claim is submitted to the insurance company by the radiology office, the radiology office is REQUIRED to provide the name of the ordering physician, in addition to the name of the radiologist who read your exam. So, if you obtain the original claim submitted by the radiology office for the CXR, you will find the name of the ordering physician.
Most radiology exams, with the exceptions of some ultrasound, interventional and breast imaging exams, are INTERPRETED by the radiologist but the radiologist does not give the results directly to the patient. This is because in most cases, the radiologist will have no role in the follow-up care of the patient.
Finally--I know this can't help you now--it is the responsibility of the PATIENT to follow-up on exam results. Don't assume that silence equals a negative result. Doctors today have literally hundreds of patients, and while this doesn't excuse what happened in your case, it does explain it. You saw your doctor multiple times after the first CXR--did you ever directly ask him for the results of the exam?
In addition, it is not uncommon for a CXR to look 'clear' on first exam, and then, when compared with a later CXR, to show retrospective evidence of malignancy. CXR's are not the best way to screen for lung CA--high speed noncontrast CT scans of the lungs are more reliable in most cases. So, it may have been that your first CXR did not cause any alarm and was read as normal--you'd have to read the original report and not the report from the second CXR (the report that listed a comparison film).
Ask your attorney if he or she saw the ORIGINAL CXR report from the FIRST exam. If she did see it, ask her if the physician's name was on it. If it was, then you should ask your attorney why the doc was allowed to debate the fact that he ordered the exam. You might find another attorney.