My ILC has the same size, 6mm. I will have Lumpectomy, not mastectomy, possibly radiation and aromatase inhibitors for about 7 years. I feel sort of lucky:) It diagnosed early, hopefully did not spread to lymph nodes, it is treatable with a small surgery. My stress level came down after I talked with a team of doctors and read about this stage of cancer. I am optimistic about the treatment outcome.