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Case Reports in Oncological Medicine
Volume 2013, Article ID 372947, 5 pages
http://dx.doi.org/10.1155/2013/372947
Case Report

Primary Acinic Cell Carcinoma of the Breast: A Clinicopathological and Immunohistochemical Study

Departments of Surgery and Pathology, Iida Municipal Hospital, 438 Yawatacho, Iida, Nagano 395-8502, Japan

Received 4 August 2013; Accepted 28 August 2013

Academic Editors: S. Aksoy and K. Aogi

Copyright © 2013 Kiyoshi Shingu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Acinic cell carcinoma of the breast is an extremely rare, malignant neoplasm characterized by widespread acinar cell-like differentiation and clinically low-grade malignancy. Herein, we report a case of acinic cell carcinoma of the breast in a 41-year-old woman. The tumor was poorly demarcated but had a firm consistency. It was removed with lumpectomy, and sentinel lymph node biopsy was performed to check for metastasis. Microscopically, the tumor showed an infiltrative growth pattern with a combination of solid, trabecular, and microglandular areas. Many of the tumor cells had abundant clear vacuolated cytoplasm containing zymogen-typed granules which resemble acinar cells of the salivary glands. The immunohistochemical profile of the tumor was also similar to that of salivary gland acinic cell carcinoma: the tumor cells were positive for amylase, lysozyme, α-1-antichymotrypsin, S-100 protein, and epithelial membrane antigen and negative for estrogen receptor, progesterone receptor, and human epidermal growth factor receptor 2. She received postoperative chemoradiation therapy and has been well for 3 years since surgery. As studies on large series are lacking, further studies are needed to elucidate the biological characteristics of acinic cell carcinoma of the breast.