Breast ultrasound uses sound waves that cannot be heard by humans to look at the breast.

Ultrasonography of the breast; Sonogram of the breast

You will be asked to undress from the waist up and put on a medical gown. During the test, you will lie on your back on the examining table.

A water-soluble gel is placed on the skin of the breast. A hand-held device (transducer) directs the sound waves to the breast tissue. The transducer is moved over the skin of the breast to create a picture that can be seen on a screen.

Breast ultrasound may also be used to guide a needle during a breast biopsy.

Because you need to remove your clothing from the waist up, it may be helpful to wear a two-piece outfit. On the day of the test, do not use any lotions or powders on your breasts or wear deodorant under your arms.

The number of people involved in the test will be limited to protect your privacy.

You will be asked to raise your arms above your head and turn to the left or right as needed.

There is no discomfort from the ultrasound.

Common uses of ultrasound are:

• In addition to a mammogram or physical exam, if something abnormal is found. If a mammogram shows a growth, ultrasound can help determine whether it is a solid mass or a cyst.
• By itself, to check a breast lump or nipple discharge

Normal breast tissue.

Normally, the breast tissue will be uniform and will not have any suspicious growths.

Ultrasound can help show noncancerous growths such as cysts, fibroadenomas, or lipomas. A cyst is a fluid-filled sac. A fibroadenoma is a noncancerous solid growth. Lipomas are noncancerous fatty lumps that can occur anywhere in the body, including the breasts.

Breast cancers can also be seen with ultrasound.

There are no risks associated with breast ultrasound. There is no radiation exposure.

Kim CH, Bassett LW. Imaging-guided core needle biopsy of the breast. In: Bassett LW, Jackson VP, Fu KL, Fu YS, eds. Diagnosis of Diseases of the Breast. 2nd ed. Philadelphia, Pa: Saunders Elsevier; 2005:chap 17.