Thanks for sharing this - information is power!
I just wanted to add something I learned from a breast surgeon about breast density; if you are (or were as a younger woman) very slim but had large heavy breasts ie a bra size with a small back but a large cup, this is a clue you likely have high density as it is all breast tissue not adipose tissue, whereas on someone in a bigger body, large breasts can simply reflect greater overall adiposity.
This is also reflected in the Nurses Health Study, where larger breasts per se were not a risk factor, but large breasts on a slim frame were.
Also as someone who has been fortunate enough to be able to access risk reducing mastectomies and also fought for flat closure, I feel really strongly that women affected by breast cancer and previvors should know that they can request both mastectomy and flat closure
These options are often not presented by surgeons who have a paternalistic bias towards breast conserving or reconstructive surgeries.