Representative patient demonstrating variation in planning target volumes (PTV) for two dose (RTOG) and three dose (3Dose) plans. Axial (A-B) and coronal (C-D) computed tomography images shown. The gross tumor volume (GTV, red line) is identical for each plan. The PTV-high dose (PTV-HD, orange) and PTV-elective dose (PTV-ED, cyan) are presented for RTOG in A and C, respectively. These volumes plus PTV-intermediate dose (PTV-ID, magenta) are displayed for 3Dose in B and D.