Breast Ultrasound Screening: What It Can and Can't Detect

Written by Kristy Beard, MSN, APRN, FNP-C — Board-Certified Family Nurse Practitioner and Founder of Elevate Health and Wellness, serving patients across the Gulf Coast in Gautier, MS and Foley, AL.

Why Mammography Alone Is Sometimes Not Enough

Mammography remains the gold standard for breast cancer screening and has been shown in multiple large clinical trials to reduce breast cancer mortality by detecting cancers before they become symptomatic. However, mammography has a well-documented limitation in women with dense breast tissue — the fibroglandular tissue that makes up a dense breast appears white on a mammogram, as does cancer. This overlap significantly reduces mammography's sensitivity in dense-breasted women, with some studies showing sensitivity as low as 30 to 48% in extremely dense tissue. According to the American College of Radiology, approximately 40% of women have dense breast tissue — making this limitation clinically relevant for a substantial portion of the female population.

What Breast Ultrasound Can Detect

Breast ultrasound uses sound waves rather than X-rays to image breast tissue, and it is not affected by tissue density. It is particularly effective at characterizing lesions identified on mammography — distinguishing fluid-filled cysts (which are almost always benign) from solid masses that may require further evaluation. Ultrasound can identify cancers that are mammographically occult — invisible on mammography due to dense tissue — particularly invasive cancers that may present as solid hypoechoic masses. Research published in the Annals of Internal Medicine demonstrated that supplemental ultrasound screening in women with dense breast tissue identified an additional 4.2 cancers per 1,000 women screened that were not detected by mammography alone.

What Breast Ultrasound Cannot Do

It is equally important to understand breast ultrasound's limitations. Ultrasound cannot detect microcalcifications — tiny calcium deposits that are one of the earliest mammographic signs of ductal carcinoma in situ (DCIS). It produces more false positive findings than mammography, leading to more follow-up imaging and biopsies that ultimately prove benign. And it is operator-dependent — image quality and interpretation vary with the skill and experience of the person performing the examination. At Elevate, breast ultrasound is offered as a complement to, not a replacement for, mammography.

Who Should Consider Breast Ultrasound at Elevate

Breast ultrasound screening at Elevate Health and Wellness is most appropriate for women with heterogeneously dense or extremely dense breast tissue identified on recent mammography — a finding that is now required to be disclosed to patients in most states; those with a palpable breast lump or nipple discharge requiring characterization; women at elevated breast cancer risk based on family history, BRCA status, or prior chest radiation who may benefit from supplemental screening; and patients who have not yet had a mammogram and want a non-radiation screening evaluation as a starting point.

Ready to schedule your breast ultrasound screening? Learn about our women's ultrasound services at Elevate in Gautier, MS and Foley, AL.

Sources: Annals of Internal Medicine. Supplemental Ultrasound in Dense Breast Tissue. annals.org. | American College of Radiology. Breast Ultrasound Guidelines. acr.org.

This article is written by Kristy Beard, MSN, APRN, FNP-C, board-certified Family Nurse Practitioner and founder of Elevate Health and Wellness. Information provided is for educational purposes only and does not constitute medical advice. Please consult a licensed healthcare provider for personalized care.