I was a grade 3 and finished radiation after my first surgery. My margins were not clear after radiation. It showed "persistant/residual" DCIS. I chose breast conservation and had a second surgery two months ago (New Surgeon). The post radiation healing is very slow - but I am happy that I did not have a mastectomy. Some of the DCIS removed were "faint calcifications"... It is good to get a second opinion. The preferred course of action for most surgeons is mastectomy. You have to find a surgeon who will work with you and communicate what is best for your situation.