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Case Reports: Rare disease
First report of bilateral synchronous male accessory breast cancer
  1. Bhoowit Lerttiendamrong and
  2. Mawin Vongsaisuwon
  1. Surgery, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
  1. Correspondence to Dr Mawin Vongsaisuwon; mawin.v{at}chula.ac.th

Abstract

Accessory breast occurs due to the persistence of milk line in the non-thoracic region. Malignant transformation in male accessory breast is very rare, with 16 reports documented across the world. No bilateral synchronous accessory male breast cancer has been reported. We present the first case reported globally of a man in his 70s with a complaint of left axillary lump and chronic rash for 3 years. About 1 year ago, additional reddish rash was detected in the right axilla. Initial skin biopsy from a private hospital confirmed mammary carcinoma with skin invasion. Subsequent left breast mastectomy with left axillary lymph node dissection and right wide excision was performed. Final pathological result was grade 2 invasive ductal carcinoma in the left accessory breast and Paget’s disease in the contralateral axilla. Postoperative treatment of adjuvant paclitaxel and trastuzumab was prescribed, which was followed by adjuvant radiation therapy.

  • Breast cancer
  • Breast surgery
  • General surgery

http://dx.doi.org/10.1136/bcr-2022-250927

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    Footnotes

    • Contributors BL: conception and design, acquisition of data or analysis and interpretation of data, manuscript writing, revision of manuscript, final approval of manuscript. MV: conception and design, acquisition of data or analysis and interpretation of data, manuscript writing, revision of manuscript, final approval of manuscript.

    • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

    • Case reports provide a valuable learning resource for the scientific community and can indicate areas of interest for future research. They should not be used in isolation to guide treatment choices or public health policy.

    • Competing interests None declared.

    • Provenance and peer review Not commissioned; externally peer reviewed.