A breast ultrasound is a procedure that uses reflected sound waves to view and produce a picture of the internal structures of the breast. A breast ultrasound can show all areas of the breast, including the area closest to the chest wall, which is hard to study with a mammogram. Breast ultrasound does not use X-rays or other types of possibly harmful radiation.

A breast ultrasound is used to determine whether a breast lump is filled with fluid (a cyst) or a solid mass. An ultrasound generally does not replace the need for a mammogram; however, it is often used to further evaluate a problem seen on a mammogram.

Learn more about breast ultrasound and what to expect during an exam.