What does this mean: " None of the calcifications are amenable to stereotactic biopsy due to the extremely faint breast compression, as little as 6 mm"?

Is the surgical excision for biopsy purposes or for removal?

Bi-Rad 4 would seem to indicate a need for diagnosis as soon as you can get it. It's not Bi-Rad5 but still suggests some abnormality, as your report stated.

I hope the breast surgeon is reassuring and gives you good information and choices. Let us know!