I meant STAGE 0 cancer, not grade 0.
DCIS is ductal carcinoma in situ, also called grade 0 cancer, and is often referred to as "pre-cancer" because it is not yet invasive. I think cribiform has to do with the architecture of the malignancy. Not sure about micropapillary unless that means you have some tiny papilloma involved. I'm guessing with the central comedo necrosis but I think it has to do with the evolution of the area and its current state. Necrosis is cell death if I remember correctly, and i think that occurs within tumors as they evolve (I know that uterine fibroids develop necrosis when they outgrow their blood supply). I think the tumor grade has to do with how aggressive it is.
All that said, you should talk to your doctor about all these specifics.
My layperson's guess about the overall meaning would be that you have DCIS that may have come from a small papillary, and it has been there long enough to develop necrosis, and it is fairly aggressive. Somebody more experienced with the comedo necrosis thing (I see it a lot in the reports people bring here) might be able to give a more accurate interpretation. One of the main things to take away from that description though is that it is DCIS, NOT invasive cancer. That is good. That means it was caught early.