Implantable devices.

Here are some useful ESTRO consensus guidelines on target volumes for post-implant breast contours, and figure 1 says it all (spoiler alert: surgeons and rad oncs offer up wildly different delineations of tissue at risk of recurrence). Turns out, depending on the type of implant placement, tissue in previous contact with removed breast tissue may all lie anterior to the implant, drastically minimizing radiation treatment volumes—and presumably risk of cosmetic complication. TBL:Multidisciplinary consensus contouring guidelines on post-implant breast radiation volumes are almost certainly smaller than you think. | Kaidar-Person, Radiother Oncol 2019