Original Article| Volume 45, P92-95, September 2017

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


      • 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.



      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.


      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).


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


      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)


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