Fig. 1

For patients with R2 resection or biopsy, the CTV-HR (yellow line) encompassed GTV (red line) with a margin. For R1 or close margin cases, the tumor bed (pink line) and operative bed were included in the CTV-IR (blue line). For R0 cases, only CTV-LR (green line) was treated. Unless the cavernous sinus is involved, it is not routinely irradiated