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[Difficult Decision about a Surgical Margin for a Non-Invasive Apocrine Carcinoma in the Breast - Report of a Case].

We report a case of non-invasive apocrine carcinoma. In this case, we could not identifythe surgical margin. The patient was 39-year-old woman. Micro calcifications were discovered on her right breast during breast cancer screening. Stereotactic vacuum assisted core needle biopsywas performed and the pathological diagnosis was sclerosing adenosis. A low echoic lesion, 26mm in diameter, was discovered in the CDE area of her left breast byultrasonography . A contrast enhanced MRI showed a high intensityarea, 26mm in diameter, on her left breast. Ultrasonographyguided vacuum assisted core needle biopsywas conducted on the low echoic area. The pathological diagnosis was non-invasive ductal carcinoma. We checked her whole bodyand found no metastatic lesion. She underwent breast conserving surgeryplus sentinel lymph node biopsy. We had great difficultyin classifying the surgical margin. The pathological diagnosis from the resected surgical specimen was non-invasive apocrine carcinoma, negative for ER and PgR, and positive for HER2/neu protein expression. The Ki-67 labeling index was 20%, the surgical margins were negative, and the clinical Stage was 0(Tis, N0, M0). She was administered radiation therapy and endocrine therapy as adjuvant therapy. Two years and 6 months after surgery, she is well without metastasis.