Check out this youtube video report about Inflammatory Breast Cancer.
My cousin died of this last year. Often there are no lumps. Instead look for spots that look like bug bites, other odd shapes or spots, hot to the touch. Mammograms do not find this. MRI or other tests are required. Your doctor may not have heard of it or ever seen a case. Both of you should get educated!
There is some information about IBC at the Susan G. Komen website.