Yes I’m also told hard to detect—but I had an egg-sized lump and was told “nothing to worry about”—until 15 months later when I was diagnosed! Just beginning long journey…letrozole, to shrink tumor then surgery. Hoping for lumpectomy instead of mastectomy. Angry that no one followed up sooner on this lump since I had lumpectomy on opposite breast 24 years ago! Healthcare is broken…