International consensus recommendations for target volume delineation specific to sacral metastases and spinal stereotactic body radiation therapy (SBRT)

•SBRT contouring recommendations for metastatic disease to the sacrum have been established.•High degree of agreement in target delineation among spine SBRT experts.•Critical first step to standardisation of target delineation practice in the sacrum.•The sacral classification system (SCS) guides the...

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