I’m not the OP, but I did have SpaceOAR inserted before my 39 VMAT sessions almost two years ago. I have had no rectal discomfort, though I did pass some blood one day over a year after the treatment. No blood since that one time. On the other hand, I have a friend who underwent similar treatment last year, but without any spacer (he was told he didn’t need it). He has had continuous rectal bleeding issues for the past several months and has had at least 3 procedures to address the issue without much success.