Ultrasound is an imaging technique that sends high-frequency sound waves through your breast tissues and converts them into images on a viewing screen.
The best way to understand what an ultrasound does is to first understand what it does not do. Ultrasounds are not a substitute for mammograms; nor are they recognized as a general screening tool for cancer.
Rather, ultrasound is most often used in conjunction with other tests. For example, if a mammogram has turned up some sort of abnormality or a doctor has felt something unusual during an exam, an ultrasound is frequently used to determine whether the abnormality is solid ( such as benign fibroadenoma, or cancer) or fluid-filled (such as a benign cyst). An ultrasound cannot however determine whether a solid lump is cancerous, nor can it detect calcifications.
Ultrasound is also used frequently in women under age 30. A younger woman's breast tissue tends to be very dense and full of milk glands. On a mammogram this tissue looks white, which makes it almost impossible to see any cancerous growths, which are also read as white. Many doctors say that trying to find a tumor in the midst of dense gland tissue can be like finding a polar bear in a snowstorm. Ultrasounds offer a better glimpse of young patient’s breast tissue.
Ultrasounds are also frequently used to guide biopsy needles to exact spots in the breast where anything suspicious has been located.
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