Thanks for the reply. I hope not to. guess I'll just have to wait and see.
For a PET scan, they give you a tracer of some sort to make a tumor show up. I do not think the benign tumors take up the tracer like the malignant ones, hence why the PET scan works (or so how I think it works).
The doctor will have to tell you if the lesion in her brain is related or not - but it may or may not be cancer. I hope not.