Are there any cases for which you would limit the dose to the scapula or ribs when treating the breast/chest wall and regional nodes?  

Dose to ribs should be limited in cases of reirradiation, where the risks of chronic chest wall discomfort, rib fractures, and bone necrosis are increased. Nonetheless the risks of serious toxicities with reirradiation appear to be low, based on a multicenter retrospective review (Wahl AO, IJROBP 2...