This is a patient with Stage IV T3 N1 M1 MSI stable adenocarcinoma of the rectosigmoid junction who presented with small volume upper retroperitoneal adenopathy and one definite biopsy-proven right segment 7 liver metastasis on PET staging.  Had excellent response to FOLFOX, particularly in the liver less so otherwise. Plan now is preop RT to primary then LAR and microwave ablation to liver lesion. Is there any role for radiation to the small group of RP nodes with IMRT, not ideal for SBRT or resection. If so, would one use involved field only and what dose fractionation? Or is treating RP nodes unlikely to impact outcome and risk undue toxicity?