https://www.bcna.org.au/understanding-breast-cancer/what-is-breast-cancer/types-of-breast-cancer/https://www.bcna.org.au/understanding-breast-cancer/treatment/surgery/types-of-surgery/The links above will help you get your head around it all - there's a link for DCIS. Surgery will give a definitive pathology outcome to determine next steps. Quite often the treatment plan can change slightly, dependent on the pathology results.
The dye you refer to is for the Sentinel Node Biopsy.
It is all overwhelming and there's no defined reason why you or me or anyone else ended up with BC. Don't belt yourself up over it as it is not your fault! Most importantly, keep away from Dr Google. The BCNA website has a wealth of information and there's always someone online and there are others on here from WA.
Take care
