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Screening Mammography Findings From One Standard Projection Only in the Era of Full-Field Digital Mammography and Digital Breast Tomosynthesis.

OBJECTIVE: The purpose of this article is to compare outcomes of findings seen on one view only from screening full-field digital mammography (FFDM) and FFDM plus digital breast tomosynthesis (DBT).

MATERIALS AND METHODS: A retrospective review was performed of 103,070 consecutive screening mammograms obtained from February 2011 through June 2014 at two community-based breast centers. Recalled findings prospectively seen on one view only were analyzed. Pearson chi-square test and Fisher exact test were performed, and 95% CIs were determined.

RESULTS: Mammograms were acquired using FFDM (n = 71,656) and FFDM-DBT (n = 31,414) during the study period, and 2213 FFDM (3.1%) and 433 FFDM-DBT (1.4%) mammograms were recalled for one-view-only findings (p < 0.0001). The final study population (1592 FFDM and 354 FFDM-DBT) was defined after 689 of these recalled FFDM and 92 of these recalled FFDM-DBT examinations were excluded for insufficient mammographic follow-up (< 24 months). Summation artifacts accounted for more one-view-only findings from FFDM (1067/1592; 67.0%) than FFDM-DBT (190/354; 53.7%) (p < 0.0001). In the FFDM cohort, 28 one-view-only findings proved malignant (24 invasive ductal carcinoma [IDC], one invasive lobular carcinoma [ILC], and three ductal carcinoma in situ [DCIS]). In the FFDM-DBT cohort, 14 one-view-only findings proved malignant (11 IDC, one ILC, and two DCIS). The positive predictive value (PPV) of a one-view-only finding was significantly lower for FFDM (1.8%) than for FFDM-DBT (4.0%) (p = 0.010).

CONCLUSION: One-view-only findings occur with both FFDM and FFDM-DBT and remain an important but uncommon sign of malignancy. They are more frequent, are more likely to represent summation artifacts, and have a lower PPV with FFDM than with FFDM-DBT.

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