Why do chemo or radition if they believe they got it all?

Hi Katy...In June of 2011 I
Hi Katy...In June of 2011 I had a bilateral mastectomy.I had stage 2 Invasive breast cancer in my left breast. I then went through 6 months of chemotherapy. My last chemo was on December 13. My surgeon or oncologist did not recommend radiation because I did have bilateral mastectomy and my surgeon told me that she got all of the cancer.
Monday I went and had my tissue expanders exchanged for Implants. That was a wonderful day. I thought this was a new beginning and it would all be behind me soon. Today My plastic surgeon called and explained to me that he had removed scar tissue during the surgery and the pathology report was back and it showed that it was positive for cancer. He said it is in situ and non invasive but I will have to have radiation and possibly another surgery. I will find out more tomorrow.
This is why having every treatment recommended is so important because they can never e 100 percent sure that they did get it all.You do whatever it takes to beat this beast.
I know chemotherapy and radiation sounds scary and it is no picnic but you will find that you have strength in yourself that you never thought possible and you will find that it's not as bad as you are imagining it to be.
Good luck
My thoughts and prayers are with you.