I found my my lump that a Screening Mammogram did not pick up. I had small, dense, breasts that almost popped out while they were being Xrayed. Add to the fact that the tumor was at the periphery of my breast, and on my chest wall, it was pretty much impossible to find it, especially with Only A Screening Mammogram! Women and Men keep feeling your breasts! And consider asking for a Diagnostic Mammogram and/or Breast Ultrasound too.