For women with dense breasts, the decision to add ultrasound screening on top of a negative mammogram carries real consequences — and a decade of data from over 100,000 examinations now puts hard numbers on both the benefit and the burden. The findings reframe the risk-benefit calculus at a time when supplemental screening is increasingly common and legislatively mandated in many U.S. states.
In this retrospective analysis of concurrent digital breast tomosynthesis (DBT) and screening ultrasound performed at a single academic center between 2014 and 2024, researchers identified 6,647 cases where DBT was negative (BI-RADS 1 or 2) but ultrasound returned an abnormal result. From this subset, 99 cancers were detected — yielding an incremental cancer detection rate of 1.0 per 1,000 screened women and a positive predictive value at initial interpretation (PPV1) of just 1.5%. The false-positive rate stood at 98.5%. Of 1,917 biopsies prompted by abnormal ultrasound findings, only 99 confirmed malignancy — a PPV3 of 5.2% — meaning approximately 95 of every 100 biopsies were unnecessary. Notably, 89.9% of detected cancers were invasive, which has relevance for assessing clinical significance.
These numbers deserve careful contextualization. DBT already represents a significant upgrade over conventional 2D mammography, improving cancer detection rates and dramatically reducing false recalls. The question this study addresses — what ultrasound adds after a negative DBT — is clinically distinct from earlier studies where ultrasound followed conventional mammography. The 1.0 per 1,000 incremental yield is consistent with prior supplemental ultrasound literature, but the false-positive biopsy rate of nearly 95% signals a substantial procedural burden. Limitations include single-center retrospective design, which may not generalize across imaging volumes, equipment, or radiologist expertise. Subgroup results by breast density and age were reportedly analyzed but not fully detailed in the excerpt, which may matter most for clinical decision-making. For health-conscious adults navigating dense-breast notification laws, this study suggests that supplemental ultrasound after a clean DBT is a tradeoff with meaningful harms, not a consequence-free safety net.