We encountered with a rare case of intraductal apocrine carcinoma of the breast. The patient was a 62-year-old woman who had undergone right mastectomy for invasive ductal carcinoma of the right breast two years previously. This time, she was diagnosed with the left breast cancer (Category4) because left mammography showed pleomorphic and segmental calcifications. Ultrasonography (US) revealed an irregular and low echoic mass. Histopathological examination by US-guided core needle biopsy showed apocrine carcinoma. Mastectomy with sentinel lymph node biopsy for breast cancer of the left breast was performed. Post operative histopathological examination revealed intraductal apocrine carcinoma without lymph node metastasis. Estrogen and progesterone receptors were negative, while androgen receptors were positive, HER2 score was 2+. Adjuvant therapy was not performed. She is under observation as an outpatient now.

  A 39-year-old woman was admitted to our hospital because a hard mass about 3cm in diameter with a tender was found in a scar of cesarean section. Ultrasonography (US) showed a 22.9×14.9×24.5 mm hypoechoic and heterogeneous mass with an irregular margin. Abdominal contrast-enhanced CT scan showed an enhanced mass in the abdominal wall. The US-guided needle biopsy of the mass was performed for the histological diagnosis and the mass turned out to be endometriosis that was positive staining for vimentin, estrogen receptor and CD10 by immunohistochemistory. Measures available for the treatment of endometriosis are hormone therapy and surgical resection. In our case, surgical resection was performed completely, because preoperative diagnosis of the disease was made from a needle biopsy. It is important to avoid extended operation and to employ appropriate therapies combined with hormone and surgical therapy to maintain the patient's quality of life, because endometriosis is a benign disease per se.