@Natwitts Mine was invasive lobular also. Very difficult to find. Had "clear" mammogram 9 months earlier! My symptoms were physical - inverted nipple and distended shape. It took ages in ultrasound, biopsies, etc. They thought it was 8-9 cm but in the end it was 12 cm. It's the fine spider-web nature of lobular that makes it so difficult to assess before surgery. Nothing left between chest wall and chest muscle. I tell everyone now to not rely on mammograms, but have ultrasounds as well. My daughter and nieces are doing that.