Stereotactic breast biopsy utilizes digital mammography in order to precisely biopsy a suspicious abnormality present on a prior mammographic study. With this system it is possible to biopsy suspicious microcalcifications or suspicious masses (although ultrasound-guided biopsy of a mass is preferred if the lesion is sufficiently conspicuous at ultrasound).
Minimally invasive biopsy is preferred to open surgical biopsy. Your physician however may choose to perform a surgical biopsy, particularly if the lesion lies too close to the skin, near the chest wall or simply cannot be clearly defined at mammography. Additionally, better cosmetic results may be possible with an excision of a likely benign lesion such as a fibroadenoma.