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Prevalence and clinical significance of incidental extra-mammary findings in breast magnetic resonance imaging: A retrospective study of 1070 patients

      Highlights

      • Data from 1070 breast MRI studies was analyzed with focus on intra-mammary and extra-mammary findings.
      • MR-BI-RADS categories 4-5 had a 10-times higher risk for major extra-mammary findings (odds ratio 10.1, P < 0.01).
      • MR-BI-RADS categories 4-5 had a 3-times higher risk of a minor extra-mammary finding (odds ratio 3.2, P < 0.01).
      • Extra-mammary breast MRI findings are common, may have important implications and should be mentioned in the reported.

      Abstract

      Purpose

      The purpose of this study was to analyze the prevalence of extra-mammary findings in magnetic resonance imaging (MRI).

      Materials and methods

      Data from 1070 consecutive breast MRI studies was analyzed. MR-BI-RADS (Breast Imaging Reporting and Data System) was used to classify the risk category.

      Results

      According to MR-BI-RADS, 915 (85.5%) of 1070 women were classified into MR-BI-RADS categories 1–3, and 155 (14.5%) into MR-BI-RADS categories 4–5. MR-BI-RADS categories 4–5 had a 10-times higher risk for major extra-mammary findings (odds ratio 10.1, P < 0.01).

      Conclusion

      Extra-mammary findings are common and may have important clinical consequences.

      Abbreviations:

      BI-RADS (breast imaging reporting and data system), MIP (maximum intensity projection), MRI (magnetic resonance imaging), FOV (field of view), EUSOMA (European Society of Breast Cancer Specialists), ROI (region of interest)

      Keywords

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