From my experience, triple negative isn't necessarily harder to detect, though it's decidedly much harder to cure, because it doesn't express any genes for the three receptors (Progesterone, Estrogen, or Her2). Inflammatory can be triple negative, but not all triple negative is inflammatory. Triple negs can still present as lumps and be excised, where inflammatory will never present that way. Inflammatory is often misdiagnosed as mastitis and can seem to 'come and go'; symptoms sometimes wax and wane without any sort of treatment. Typically at diagnosis it is staged at St III. It is considered a systemic cancer - in other words, lumpectomy is not an option and generally it's too late for mastectomy.