Dose received by the sentinel node volume during tangential radiation therapy to the breast.

The dose received by the sentinel node (SN) volume during tangential irradiation was studied on 31 patients. Of the 50Gy prescribed to the breast volume 95% of the SN volume received from 6.9 to 27.5Gy. In 19 patients the SN volume overlapped with the tangential field deep side.