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lung cancer.
After reading this last post I can tell you are doing the same thing in using the internet to self dx. Thats my first mistake. It's pretty much ruining my life and I don't want to see anyone else go down this road. Stress and anxiety is nothing to take lightly.
Having said all that, I wanted to address the bottom of your post.
you mention "chest radiograph" - This is a chest xray not a ct scan. A chest x ray can miss a lesion because sometimes they could be hidden behind boney structures or shadows. A CT Scan is much more accurate than a chest radiograph and can take slices from different angles. So if you had a clean CT last month, its unlikely that you have anything. But I'll defer to Dr. Heinrik to confirm that.
As for blood exams, they are not really reliable for any type of LC. Especially in early detection. They are good for more advanced stages that secrete stuff into the blood stream or if it metasises(forgive the spelling) to other organs and causes over or under production of bodily chemicals.
Good Luck, Stay Positive and Peace
The best thing to do is to discuss your symptoms at length with a doctor and then to map out the affected areas during the examination.
There are some points you need to consider.
Yes, early disease may not be detectable with physical examination maybe not even with scans.
Pain is not a sign of early disease. Hence, if there is something there, the MRI (currently the best imaging tool for this area) would be able to see something.
IF we would imagine it to be too small for the MRI, then odds are the pain is not diffuse. You report pain involving the shoulder and the clavicle and the neck. What are the odds that all of these areas would be individually affected? (hence, the importance of mapping out exactly where you feel the symptoms).
There is no blood test to diagnose Pancoast tumor.
Stay positive.