Purpose To compare the outcome of architectural distortion (AD) without associated mass only on digital breast tomosynthesis (DBT) with AD seen at two-dimensional (2D) mammography and to evaluate if the incidence of malignancy is influenced by the presence of a correlate at ultrasonography (US). Materials and Methods This retrospective study had institutional review board approval and was HIPAA compliant. All consecutive cases in which patients with AD were ultimately assigned Breast Imaging Reporting and Data System (BI-RADS) 4 or 5 categories from 2009 to 2016 were reviewed by three readers for visibility (2D vs DBT). The level of suspicion was assigned using a Likert scale. Pathologic results were compared between 2D-detected and DBT-detected AD. Frequencies were compared by using the McNemar and Pearson χ exact tests. Results One hundred eighty-one AD lesions were included; 122 (67.4%) were 2D visible while 59 (32.6%) were DBT detected. Forty-two women (with 43 lesions) underwent 2D mammography prior to initiation of DBT. In 117 women with 121 AD lesions who underwent 2D mammography plus DBT, 59 lesions (48.8%) were detected only with DBT. The malignancy rate based on final pathology was significantly higher for 2D-detected AD (53 [43.4%] of 122) compared with DBT (six [10.2%] of 59) (P < .001). A US correlate was more frequent with 2D-detected AD (103 [84.4%] of 122) than DBT (33 [55.9%] of 59) (P < .001). Malignancy rate was not different for DBT-detected AD with (four [12.1%] of 33; 95% confidence interval [CI]: 3.4%, 28.2%]) or without (two [7.7%] of 26; 95% CI: 0.9%, 25.1%]) a US correlate. NPV based on radiologists' level of suspicion was high (91.8%-98.0%) but not sufficient enough to forgo biopsy. Conclusion DBT-detected suspicious AD has a lower malignancy outcome compared with 2D mammography-detected suspicious AD, although still high enough to warrant biopsy. RSNA, 2018 Online supplemental material is available for this article.
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