A breast ultrasound is most often used to check a breast lump found on breast self-examination, physical examination, or on a mammogram. An ultrasound can tell if a breast lump is filled with fluid (a cyst) or is solid. A lump that has no fluid or that has fluid with floating particles may need more tests.
A breast ultrasound does not cause pain. A small handheld unit called a transducer is gently passed over the breast. A computer converts the sound waves into a picture that is shown on a TV screen. The picture is called a sonogram or ultrasound scan.
Breast ultrasound does not use X-rays or other potentially harmful types of radiation.
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