Figure 1.

Radiotherapy for the superior mediastinum lymph nodes of Case 4 was planned using computed tomography (CT) images. The dose planning images shown are the coronal section, sagittal section, and horizontal section. Six horizontal sections were extracted at the levels of: (a) the seventh cervical vertebra (C7) including the left stellate ganglion (LSG); (b) the first thoracic vertebra (Th1); (c) the second thoracic vertebra (Th2); (d) the aortic (Ao) arch; (e) the pulmonary artery (PA) bifurcation; and (f) the left atrium (LA) with the left pulmonary vein (PV). The estimated delivery dose was drawn on the radiation therapy planning CT images using isodose lines: 10% violet, 30% green, 50% yellow‐green, 70% magenta, 90% orange‐red, and 95% red