Chestwall with IMC:
This patient had a pT2aN2 IDC of the left breast, upper outer quadrant, with 6 positive axillary nodes, s/p mastectomy and level I/II AxLND. We designed these fields with a common isocenter for the SCF and tangent fields. We feathered the superior and inferior IMC fields with the bolus and nonbolus tangent fields. Although we don't often utilize this technique, we found that the gantry angle on the extended SSD electron fields should be angled approximately 5 to10 degrees to the vertical from the photon tangent gantry angle.