How would you plan adjuvant radiation for a N+ breast cancer in a patient who had received prior lung SBRT near the treatment field?  

I have had cases with SBRT and started off with CT planning for the breast; I have used DIBH. I then fuse previous dose plan to current plant. For these cases, I have not always used VMAT. If this is lung SBRT, typically OAR constraints are not drastically affected for breast RT with respect to ips...