Figure 1.

Treatment volumes for individualized involved-field stereotactic body radiation therapy (SBRT). Patient-specific involved fields were utilized, which included specific nodal basins depending on the location of the patients’ PET-positive nodes. For patients with isolated para-aortic involvement, the para-aortic nodal basin alone was treated. If either the left or right common iliac nodal basins were involved, the bilateral common iliac nodal basins were treated. Finally, if the obturator, external iliac, or internal iliac nodal basins were involved on either side, all three unilateral nodal stations were included in the involved field.