I just finished my radiation from DCIS stage 0 grade 3. I did a little extra radiation because I’m not going to do the AI inhibitors. Just had a lumpectomy and got it all with clear margins. The radiation really got me down and I thought I was in pretty good shape! My friend had stage 0 grade 3 and had a double mastectomy! I did have the MRI though. Mine was very small like it sounds like yours is too.