My cancer was missed on a bone scan prior to my double mastectomy. I asked what lower lumbar degeneration was and asked to be scanned several times

I was told my cancer didn't respond to chemo or radiation. I went back with severe pain and was told to see an orthopedic doctor. The hospital told me I had lung cancer and subsequent scans showed bone metastases. The oncologist sent me a certified letter quitting my care. I found another doctor and am now stage 4 but I'm in remission. Can I sue? My radiologist said he would stand up in court for me