@rachieb this is exactly the choice I had (with some discussion about whether if there were quite a few positive radiotherapy only would suffice or not). Which hospital are you at? I met with both radiotherapy consultants and the surgeon to discuss the options as it felt like a significant decision. Being so young I felt my surgeon was very invested in my quality of life afterwards too. I went for the sentinel nodes approach and was really pleased I did. I think it is so personal though so do have a think.
Hopefully their approach on scanning is because they are very confident there’s no distant spread. My MRI was what prompted a PET CT because there were some concerning features.
Really pleased for you that the surgery is so soon. I found my mastectomy and node removal much less bad than I expected. My main tip would be to do the exercises after the surgery as they really helped: Exercises after breast cancer surgery | Breast Cancer Now
xx