Comparison of BI-RADS® classification of magnetic resonance screening with BI-RADS® for mammography and ultrasonography

Abstract

Objective: The objective of this study was to compare BI-RADS® magnetic resonance imaging (MRI) in relation to
BI-RADS® mammography (MMG) and ultrasonography (USG) from previous exams, determining the level of agreement
between the three methods. Methodology: This is a retrospective cross-sectional study of examinations of women with
indications for MRI in an imaging clinic in the city of Goiânia, GO, from 2021 to 2022. The sample was divided according to the BI-RADS® classification into two groups, one with low suspicion for classifications 1, 2, and 3 and another with
high suspicion for classifications 0, 4, 5, and 6. The distribution of the sample profile in patients with BI-RADS® MRI low
suspicion and high suspicion was tested by applying Pearson’s chi-square test, relative frequency, and absolute frequency.
Data were analyzed using the Statistical Package for Social Science (SPSS 26.0) with a significance level of 5% (p<0.05).
Results: A total of 294 MRI scans were evaluated, of which 136 (46.3%) had previous MMG and 158 (53.7%) had previous
USG. Comparing the BI-RADS® MRI classification with the BI-RADS® of previous high-suspicion exams, it was observed
that both were concordant (p<0.01), with 60% BI-RADS® MMG and 57.1% USG. Regarding the change in the BI-RADS
classification, in 17.8% of the BI-RADS® of the MMG and USG exams as low suspicion after MRI, it changed to high suspicion; 18.7% of BI-RADS® from MMG and USG exams as high suspicion after MRI changed to low suspicion; 11.6% of
BI-RADS® from MMG and USG exams as high suspicion after MRI had alteration, but remained in high suspicion; and
51.7% of BI-RADS® from MMG and USG exams as low suspicion after MRI had alteration, but remained in low suspicion.
Conclusion: Comparison of BI-RADS® MRI with BI-RADS® from previous exams shows the agreement factor in the detection of high suspicion for breast analysis.