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Internal mammary lymph nodes as incidental findings at screening breast MRI

      Abstract

      Objective

      To evaluate the prevalence of internal mammary lymph nodes (IMLNs) on breast magnetic resonance imaging (MRI) in a screening population.

      Materials and methods

      We retrospectively reviewed 92 consecutive screening breast MRI exams. Logistic regression was performed to ascertain the risk of IMLNs in cancer-free subjects and to determine whether the risk varies with age.

      Results

      IMLNs were present in 48.9% of patients. Mean node size was 4 mm (range, 3–10 mm). The prevalence of IMLNs was not related to age. No patients developed breast cancer after a mean follow-up of 3 years.

      Conclusion

      Subcentimeter IMLNs are common incidental findings at screening breast MRI.

      Keywords

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