Accidental Discovery of Concomitant Lobular Carcinoma in situ and Ductal Carcinoma in situ of the Breast—A Case Report—

Abstract

The accidental discovery of lobular carcinoma in situ (LCIS) of the breast is increasingly common, and how it should be handled may be a difficult question. A 44-year-old woman presented with pain in the left breast. Visual inspection and palpation did not identify any abnormality in either breast, and mammography only showed benign calcifications. On ultrasonography, however, a clearly demarcated lobular mass with a hyperechoic center was apparent in region D of the right breast. Fibroadenoma or LCIS was suspected from the results of needle biopsy, and tumorectomy was therefore performed. The histopathological diagnosis was fibroadenoma surrounded by LCIS and ductal carcinoma in situ (DCIS). Since both margins were positive, additional partial mastectomy was performed. The LCIS margin was partly positive, but rather than further surgery, breast-sparing radiotherapy was performed instead. The patient is currently taking tamoxifen citrate and remains under observation.