I had a great breast surgeon who told me that MRI is notoriously wrong when it concerns picking up cancerous lymph nodes with breast cancer.

I had chemotherapy before surgery and I could feel the cancer growing back, and I was concerned that my surgeon was waiting too long to do the surgery.

He did Ultrasound, and ordered MRI just before the surgery and all the lymph nodes showed up negative for cancer.

Then, during surgery, it turns out that not only were most of them positive for metastatic cancer, but that in fact, the chemotherapy had killed, (if not very effectively) a bunch of them, and that the cancer had come back and spread into adjacent tissue.

Just thought I would mention this. Kat