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CyberKnife planning of stereotactic body radiotherapy for paraaortic lymph node metastases from colorectal cancer. A: Axial view 1; B: Sagittal view; C: Coronal view; D: 3D view. Gross tumor volume (red arrow) was defined as the visualized lymph node. The radiation dose, 48 Gy in 3 fractions, was prescribed to the 80% isodose line of the maximum dose in order to cover the planning target volume.
