Intraoperative ultrasound in breast cancer surgery-from localization of non-palpable tumors to objectively measurable excision.

Over time, the use of IOUS has been transformed from being the means of localizing non-palpable lesions to an instrument yielding a reduced number of positive resection margins, with a smaller volume of healthy breast tissue excided around tumor, by making the excision of the tumor optimal and objectively measurable.