I had a a mammogram before xmas due to finding lumps, all was well thankfully, and as far as I know not at high risk. But they did have trouble seeing anything though the mussel tissue due to it being to dense. So I had to have a aultra sound as well, with this I mind I also have to have unders there is no room for movement there. I will have to have regular check ups because I do suffer with random lumps. I have read on a NHS web site, it states it’s easer for them to scan with unders but you will have to tell them so they can make allowances for them. Me personally would prefer just to have the aultar sound any way and they seem to see better. Hope this helps just a little, x