The results of examination in patients with focal asymmetric density on screening mammography

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  • Iwamoto Naoko
    Department of Breast Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
  • Aruga Tomoyuki
    Department of Breast Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
  • Ohnishi Mai
    Department of Breast Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
  • Goto Risa
    Department of Breast Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
  • Ishiba Toshiyuki
    Department of Breast Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
  • Honda Yayoi
    Department of Breast Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
  • Miyamoto Hiromi
    Department of Breast Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
  • Horiguchi Shinichiro
    Department of Pathology, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital

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  • 検診マンモグラフィにおいて局所的非対称性陰影と判定された症例の精査結果

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Purpose: The aim of our study was to evaluate patients with focal asymmetric density（FAD）on screening mammography. Patients and Methods: We retrospectively reviewed 194 women with 195 lesions who needed to be recalled to our hospital because of detection of FAD on screening mammography between January 2016 and December 2017. Results: Of all the cases, 134 cases（68.7％）were diagnosed as category 1 on diagnostic mammography and 61 cases（31.3％）as category 3 or 4. Category 3 diagnosis included FAD in 39 cases（20％）, mass in 15（7.7％）cases, and suspected architectural distortion in one case（0.5％）. Category 4 included mass in 5（2.6％）cases and architectural distortion in one case（0.5％）.Among the 39 cases with FAD detected on diagnostic mammography, 30（77％）were judged as category? 2 by breast ultrasound（US）and one patient was diagnosed as having ductal carcinoma in situ（DCIS）．Among the 6 cases with category 4 on diagnostic mammography, 5 were malignant and were classified as invasive ductal carcinoma（IDC）. Conclusions: Among the patients who were diagnosed as having FAD by screening mammography, only 20％ actually had FAD on diagnostic mammography. We suggest that FAD is overdiagnosed by screening, and that if the patients had been screened by breast US, a considerable number would not have had to be recalled.

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