Hi - I'm sorry for this challenge you're going through. There may be a tumor in your breast that's hidden enough that the mammogram didn't pick it up. Or, as they say, it could be lymphoma. Breast cancer is usually pretty symptom-less; you don't feel tired or sick, you just suddenly discover a lump, either by feeling it, or via mammogram or MRI. I'm not a doctor and can't hazard a guess what those masses might be. I'd say at this point, all you can do is wait for the next test. Best of luck to you- PJH

Inflammatory breast cancer (IBC) often doesn't show on a mammogram because the cancer forms in sheets rather than a solid lump, but I would think that you would be seeing some other breast symptoms such as swelling and/or redness by the time 4 cm masses were in the axilla.  Most IBC patients don't have a lump, but the mammogram will often show some changes in density and skin thickness from the previous mammogram.  If you have previous mammograms, be sure someone goes back to look for subtle changes that might be one clue in finding IBC.  I hope the biopsy brings good news.