Re: shadow on an x-ray ...
Don't get yourself in an uproar. It sounds like your mom is bracing for the worst. Not a bad idea actually. It shows that she has forethought. Smart woman.
"Shadows" on her lungs could be allot of things. Yes, cancer is one of them but I would relax for now. Let the doctors diagnose it and then look at what treatment options are available if it does turn out to be cancer.