A stereotactic biopsy is used to collect tissue samples from a suspicious mass before it can be felt during a breast exam.
After the lump is detected through a mammogram or ultrasound, two-dimensional images of the breast are taken from two different angles. Next, both of these images are closely examined on a computer to compare the data from each image and calculate the three-dimensional breast coordinates to check for breast abnormalities. Using this ultra-detailed information to guide the biopsy needle, a radiologist or physician can accurately sample fluid or tissue for testing purposes.