My mom has been diagnosed with cancer due to the metastasis, that start on her overies going to her kidneys, liver, lungs, and brain, but she has no cancer cells. The Dr done a biopsy on the mass on her lungs and told her they couldn't say it was or was not cancer, they had not seen anything like it. How could the dr diagnose her with cancer if there is no cancer cells, and if not cancer what could it be?