Abstract
A 67-year-old woman visited our hospital complaining of both an elastic hard tumor, 2.0 cm in size, of the right breast, C region, and an elastic hard tumor, 1.5 cm in size, of the left breast, C region. Mammography showed an irregular tumor shadow with spicula and microcalcifications in the right breast, C region, and a focal asymmetric density (FAD) in the left breast, C region. Ultrasonography showed a low echoic lesion, 22×10 mm in size, in the right breast, C region, and a low echoic lesion, 15×8 mm in size, in the left breast, C region. Histological examination of core needle and excisional biopsy specimens revealed invasive carcinoma, apocrine carcinoma of the left breast and apocrine ductal carcinoma in situ of the right breast. Synchronous bilateral breast cancer was diagnosed. Bilateral mastectomy with disection of the axillary lymph nodes was performed. Postoperative histology revealed bilateral apocrine ductal carcinomas in situ without lymphatic metastasis. Estorogen receptor positivity was borderline, progesterone receptors were negative and HER2 was negative (1+).
