What other tests diagnose breast cancer?

I was diagnosed in September of 2007 with inflammatory breast cancer. I had chemo, surgery during which 20 lymph nodes were removed on the right side and then radiation. After, there was no sign of cancer anywhere. Not until May 2009, when I began Herceptin. I have some symptoms of IBC but nothing found in a digital mammogram or ultrasound. What other tests would you suggest?