Survivor since 2010
DCIS is cancer, but has not become invasive yet (spread outside the milk ducts). It is not a pre-cancer and it is not benign. You will likely not need any chemo but because it is cancer you will need surgery and possibly radiation and adjuvant therapy (a medication like tamoxifen or Arimidex). If you are BRCA (genetic testing would confirm this -ask your surgeon or oncologist if you should consult with a geneticist), the treatment suggested by your surgeon is NOT overly aggressive. That is because if you are carrying a BRCA mutation (as I am- I am BRCA2 and have had the treatment your surgeon recommended) you are at a much higher risk than non-carriers of developing another cancer in the same breast or a separate occurrence in the other breast. Removing both breasts reduces this risk by at least 90%. Best wishes to you - I know this is a very difficult decision to make. Please know that having a double mastectomy and reconstruction is not easy by any means, but the reconstruction options make it psychologically much easier.