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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.