What is your superior field (or CTV) border when treating para-aortic lymph nodes with extended field radiation therapy for endometrial cancer in the post-operative setting?

For prophylactic pa nodal region treatmentIi treat up to the renal vessels and dont use any bony landmark.

If there is a node up to the renal vessels that is involved, then I consider extending 2 to 3 cm above the involved node including and contouring retrcrural region.

See below reference for above ...