Sadly my experience comes from too much history with cancer in my family. When my brothers lesion in his liver first showed up they looked with ultrasound immediately to rule out a distortion in the MRI or things that were obviously not cancer. Then did a PET/CT to decide it was yes, metastatic cancer in the liver. When they did the PET, all the different tumors lit right up like a Roman candle. Our doctor shows us the scans. This has been true with my husbands bone cancer, and my breast cancer as well. I have been told PET is pretty definitive for cancer but since they are really freakin expensive, they have to jump through a few hoops before they can get it approved. I won’t rant about insurance companies here, I will save that for the comfort of my own home, but I believe that is why they use ultrasound to rule out the obvious first. @mjwhearts22 pretty much summed up the risk of not knowing.
When is your ultrasound scheduled? Do you have a medical oncology appointment yet?