When pre-operatively treating high grade soft-tissue sarcomas involving the chest, abdomen, or pelvis what margins do you use for CTV and PTV?

Hi, there are some recently published consensus guidelines for pre-operative radiotherapy for retroperitoneal sarcomas. These in general recommend a 1.5-2 cm CTV margin if an 4D imaging and an ITV is used, with larger sup-inf margins (up to 2.5 cm in the upper abdomen) if 4D is not used to delineate...