Argy
and
for you. How are you feeling? I am glad you have got some answers. It sounds like you have a good team. Fingers crossed for the other tests. And ask anything at all that you need to. Nothing is really off limit here!
Isadora welcome to the thread, but sorry that you need to join us :)
Like amber I am a bit surprised about the additional radiation when they are looking for cancer caused by radiation. Why do they use mammogram and MRI? I know someone else who has breast MRIs due to family history of breast cancer, but she has those instead of mammograms.
Anyway, that aside, have you been offered any counselling to talk this through?
And have they discussed the various reconstruction options with you? If that is something you would be interested in.
I suppose the benefit of being in this situation is that you can gather as much information as possible and discuss it with anyone you think might be able to help you to decide.
Breast Cancer Care has a bit of very general information on their website here. It is about genetic risk, but the bit about surgery is presumably very similar. If you go right to the end, under the bit about Raloxifene, it says: Being told that you have a moderate or high risk of developing breast cancer can be very upsetting and it can be difficult to decide about risk-reducing treatments. You can call us on 0808 800 6000 to talk about your options. You can also talk to one of our volunteers through our Someone Like Me service. We can put you in touch with someone who has had to make the same sorts of decisions. I think their helpline has qualified nurses, though I am not sure as I have bowel cancer so I have never used it. But that might be helpful if your medical team have not given you much information.
Sorry, this is really rather a useless answer. I didn't have breast cancer so I can't really advise about the surgery itself. Feel free to ask as many questions here as you need to though 
I hope everyone is having a good Friday night! I have been working on our Lacies' guide to cancer ready for the new thread, and I am now waiting impatiently for us to fill this one up
(I will probably make a new one tomorrow even if we haven't quite filled this one as it seems like a nice idea to have a new one for the New Year)