So it was only yesterday that I was told my dad had an X-ray and they found a shadow in his lungs, he had been suffering from very bad back pains which made him go to the doctor, he's had his further scans today and we are waiting until Monday for the results. I'm honestly feeling my worst right now, I can't even think what it would be like to ever lose him. We're hoping it's not cancer but the days are going by so slow and I just want to know quickly!! My dad has been a smoker for 40 years if that helps. What would this most likely be? Is it most likely to be cancer or is it likely to just be something harmless?