When doing a tumor bed boost following whole breast irradiation, what do you typically use for CTV and PTV margin for photon and electron plans?

The optimal boost volume is unknown. Small differences in the size or placement of the boost seem unlikely to impact the risk of recurrence (1,2). Intrafraction motion of the excision cavity is small (3). My own practice is to give a total expansion of 15 mm around the excision cavity to create the ...

This is one of the few times that I do not do a traditional CTV/PTV expansion. "Old school" was a block margin of 2 cm around the scar - and then boost to a selected depth + choose IDL for coverage ("90% at 2 cm depth). We do know now that we risk missing the cavity if we rely on the scar, as we are...

Defining boost volumes has changed considerably over the years, with changes in surgical technique being the primary driver. NSABP surgeons were trained to make an incision over the tumor, then carry it all the way down to the chest wall fascia in an expanding cone shape that encompassed the mass to...