I believe the RN here quotes
50-75% of Birad 4 biopsies are benign, but my surgeon told me about 75% are benign. for
a stereotactic biopsy they use mammogram (or some use a similar proceedure with ultrasound) to find the area to biopsy. They make a 1/4 inch incision for
the needle which I understand can point different directions to take numerous samples. Very, very thin slices of tissue are removed using a vacuum type suction.