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Coronal (A), sagittal (B), and axial (C) views of a butterfly intensity-modulated radiation therapy (IMRT) plan (left) and plan using anteroposterior-posteroanterior (AP-PA) photon beams (right). Red isodose lines represent 30.6 Gy; orange, 20 Gy; green, 10 Gy; and purple 5 Gy. The clinical target volume (shaded green) includes initial sites of nodal involvement. The Butterfly IMRT plan limits the 30.6-Gy dose to the breasts (panel C).
