AUTHOR=Chen Ling , Wu Zujian , Guo Chi , Wan Hengjin , Wu Shouguo , Wang Guoping 

TITLE=Triple-negative accessory breast cancer occurring concurrently with primary invasive breast carcinoma: a case report

JOURNAL=Frontiers in Surgery

VOLUME=11

YEAR=2024

URL=https://www.frontiersin.org/journals/surgery/articles/10.3389/fsurg.2024.1252131

DOI=10.3389/fsurg.2024.1252131

ISSN=2296-875X

ABSTRACT=<sec><title>Introduction</title><p>Accessory breast cancer (ABC) is an extremely rare condition, particularly the presence of triple-negative ABC with ipsilateral invasive <italic>in situ</italic> breast cancer. Binary breast tumors are controversial in terms of surgical methods and comprehensive treatment.</p></sec><sec><title>Case presentation</title><p>We share the case of a 64-year-old postmenopausal woman who presented with an underarm mass for 3 months. Ultrasonography and computed tomography suggested possible breast cancer with axillary lymph node metastasis. The patient underwent a left modified radical mastectomy combined with axillary lymph node dissection. The postoperative pathology confirmed a binary tumor, prompting us to initiate comprehensive treatment.</p></sec><sec><title>Conclusion</title><p>We present the treatment approach for a rare case of triple-negative para-breast cancer complicated with carcinoma <italic>in situ</italic> of the breast, hoping to contribute new therapeutic ideas for the treatment of this disease.</p></sec>