The possible rib-lump is an entirely new lump, on the other breast. Ultrasounds haven't found any abnormalities in that breast 6 months ago. I don't know if that has changed.

The lump in my right breast was felt upon examination by the doctors. It was found on the ultrasound too. It is "most likely" a fibroadenoma. I'm guessing they are saying this because of my age.

I've read of people my age having breast cancer and the diagnosis being delayed for months and months because no one thought it was cancer that their age.

I've not had a mammogram. I suspect this is because my breasts are too dense at my age for the mammogram to be accurate.