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Breast ultrasound (also called sonogram) is an imaging method using sound waves to look at the internal structure of breasts. Ultrasound is particularly sensitive at distinguishing fluid-filled cysts from solid masses. Therefore, in women of average risk, ultrasound is not used as a screening tool for breast cancer, but is used as a diagnostic tool to get a better view of abnormalities found through examination or mammogram. Studies have looked at ultrasound as a screening tool for breast cancer in high-risk women. One study compared mammograms, MRI and ultrasound for screening in women with BRCA mutations. In this study, ultrasound found only 33% of the cancers found in the study compared with 77% found by MRI. Research to further determine the benefits of ultrasound in high-risk women are ongoing. Currently there are no NCCN recommendations for breast screening using ultrasound.