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Scientific Session 17 — Breast -MRI/New Technologies

Wednesday, May 3, 2017

Abstracts 1031-2861



2287. Potential Use of the BI-RADS Mammography Atlas for Lesions Detected on Dedicated Breast CT

Kuzmiak C1*,  Jung H2,  Langman E1 1. University of North Carolina, Chapel Hill, NC; 2. CHA Bundang Medical Center, Seongnam, Korea

Address correspondence to C. Kuzmiak (Cherie_Kuzmiak@med.unc.edu)

Objective: Our purpose was to evaluate the use of the 5th edition of the American College of Radiology BI-RADS Mammography Atlas for characterization and assessment of lesions on dedicated 3D breast CT.

Materials and Methods: Five expert radiologists trained in breast imaging were recruited in this retrospective institutional review board–approved study. The enrolled radiologists, who were blinded to mammographic findings and histopathologic results, individually reviewed 30 randomized 3D breast CT cases that contained 34 marked lesions. The reader was asked to specify type, features, location, size, and a BI-RADS assessment score for each marked lesion. The readers’ diagnostic performances and interreader reliability were calculated using a generalized estimating equation and the kappa statistic.

Results: Thirty-four lesions were included in this study: 24 (70.6%) masses, seven (20.6%) calcifications, and three (8.8%) architectural distortions. Eight (23.5%) lesions were malignant and 26 (76.5%) were benign. The overall sensitivity and specificity were 0.950 and 0.431, respectively. There were no significant differences of the performance for the lesion types. However, the specificity of masses and distortions (0.467) was mildly increased compared with calcifications (0.280). Across all lesions, there was slight agreement (κ = 0.176; 95% CI, 0.031–0.326) between the readers. However, kappa analysis by lesion type showed fair agreement (κ = 0.271; 95% CI, –0.129 to 0.551) for calcifications and slight (κ = 0.142; 95% CI, –0.019 to 0.312) for masses and architectural distortion.

Conclusion: Dedicated breast CT is a novel new breast imaging technology that is now clinically available. The 5th edition of the BI-RADS Mammography Atlas may be a potential starting point in the development of a dedicated BI-RADS lexicon for DBCT.