An ultrasound-guided breast biopsy is a relatively quick, low invasive, and low-risk procedure performed by a radiologist to sample a suspicious lesion that is visible by ultrasound within the breast.
Prior to the procedure, local anesthetic is administered to the breast tissue surrounding the lesion until it is numb. The radiologist then makes a small nick in the skin, advances the biopsy device to the lesion, and takes a few small tissue samples all while visualizing the area with ultrasound.
The tissue samples are sent to a pathologist for review.