Figure 2.

(a) Representative schematic showing regions of nodal failure in cholangiocarcinoma patients treated with stereotactic body radiation therapy. Nodal regions are as follows: yellow = porta hepatis, purple = aortocaval, blue = gastrohepatic, green = para-aortic, orange = retrocrural. (b) Representative cross-sectional image of an elective nodal irradiation stereotactic body radiation therapy treatment plan. The image is in colorwash, 23.75 Gy isodose cloud showing coverage of the planning target volume (red), elective nodal region (blue), liver (dark green), and duodenum (light green).