Breast Ultrasound

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.

For a breast ultrasound, a small handheld instrument called a transducer is passed back and forth over the breast. It sends out high-pitched sound waves (above the range of human hearing) that are reflected back to the transducer. A detector analyzes the sound waves and converts them into a picture that is displayed on a video monitor. The picture produced by ultrasound is called a sonogram, echogram, or ultrasound scan. Pictures or videos of the ultrasound images may be made for a permanent record.

Why It Is Done

Breast ultrasound is done to:

  • Evaluate a breast lump found on breast self-examination, physical examination, or mammogram, or when there is some other reason to suspect a possible abnormality. It is useful for determining whether a breast lump is fluid-filled (a cyst) or a solid mass. A lump that has no fluid or that has fluid with floating particles may require further evaluation.

  • Evaluate the breasts in younger women because their breast tissue is often more dense, and a mammogram may not show sufficient detail.

  • Guide the placement of a needle or other instrument during a breast biopsy or breast surgery.

  • Monitor the growth of a cyst or guide the placement of a needle to drain the cyst.

  • Evaluate your breasts if you have silicone breast implants or dense breasts. In these situations, a mammogram may not be helpful in identifying breast lumps.

  • Evaluate your breast symptoms, such as pain, redness, and fever.

How To Prepare

Wear a two-piece outfit so that it is easy to undress above the waist.

How It Is Done

A breast ultrasound is usually done by a specially trained technologist.

You will be asked to undress above the waist and drape a paper or cloth covering around your shoulders. Remove all jewelry from around your neck.

Gel will be spread on your breast to improve the passage of the sound waves (they do not pass easily through air). The transducer is pressed against your breast and moved back and forth over it. A picture of the breast tissue can be seen on a video monitor.

A breast ultrasound test usually takes between 15 and 30 minutes. Additional time may be needed if a breast exam will be done before the ultrasound or if a biopsy is also scheduled. You may be asked to wait until a radiologist has reviewed the information. If a breast examination is done before the ultrasound test, the testing may take up to an hour. The radiologist may want to do additional ultrasound views of some areas of your breast.

How It Feels

The gel may feel cold when it is applied to your breast unless it has been in a warmer. You will feel light pressure from the transducer as it passes over your breast, but you should feel no discomfort unless your breast is tender because of fibrocystic breast changes, an abscess, or other infection. You will not hear the sound unless a duplex Doppler ultrasound is done to evaluate blood flow to the area.

Risks

There are no known risks associated with a breast ultrasound test.

Results

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.

What Affects the Test

Several factors can interfere with your test and the accuracy of the results.

  • Moving during the procedure can interfere with the quality of the breast ultrasound picture.

  • Having an open wound in the area that needs to be viewed may interfere with the ultrasound.