Palpable Lump Seen on Mammo, Not Seen on US, Now Need Biopsy?

Hi everyone,

I'm a little confused about tests I had this week and wondering if anyone has any insight or has been in a similar position.

I'm 39 with a family history of breast and ovarian cancer (older grandmothers) so I've had two preventative and normal mammograms and US due to dense breasts over the last few years (last OK mammo/US was Nov '18). I felt a lump in my upper right breast this past week, saw my GP and went in for a diagnostic mammogram a few days later coupled with US. The radiologist said that there is new tissue showing on the mammogram, but while both she and the US tech could feel the lump they could not see anything on the US. They would have done a US guided biopsy right there but because they couldn't see it I now have to meet with a breast surgeon and have a stereotactic biopsy.

Has anyone had something show on the mammogram and not US? Would this indicate it's normal tissue? I'm confused, the radiologist seemed stumped and I'm a wreck waiting to meet with the breast surgeon next week.