{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T12:00:31Z","timestamp":1785326431755,"version":"3.55.0"},"reference-count":16,"publisher":"BMJ","issue":"4","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2021,3,24]]},"published-print":{"date-parts":[[2021,4]]},"abstract":"<jats:p>Accessory breast tissue (ABT) is found in approximately 2%\u20136% of the female population and are subject to most of the physiological and pathological changes that occur in pectoral breast. Primary breast cancer occurring in ABT is a rare occurrence and a second primary breast cancer occurring in an accessory breast has never been reported. We report the case of a 60-year-old woman with a history of mastectomy for left breast cancer 5\u2009years prior to presentation, who presented with an enlarging right axilla mass found to be a second primary breast cancer in an accessory tissue on biopsy. Many physicians are unfamiliar with the clinical presentation of accessory breast cancer due to the rarity of the condition and this ultimately results in delayed diagnosis and advanced disease at presentation. It is therefore prudent that physicians have a high index of suspicion when patients present with axillary masses.<\/jats:p>","DOI":"10.1136\/bcr-2020-241361","type":"journal-article","created":{"date-parts":[[2021,4,8]],"date-time":"2021-04-08T12:44:59Z","timestamp":1617885899000},"page":"e241361","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":13,"title":["Case of second primary breast cancer in ectopic breast tissue and review of the literature"],"prefix":"10.1136","volume":"14","author":[{"given":"Jamin Kweku","family":"Addae","sequence":"first","affiliation":[{"name":"General Surgery, Florida Atlantic University, Boca Raton, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Genuit","sequence":"additional","affiliation":[{"name":"General Surgery, Florida Atlantic University, Boca Raton, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph","family":"Colletta","sequence":"additional","affiliation":[{"name":"Breast Surgery, Lynn Women's Health and Wellness Institute, Boca Raton, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kathy","family":"Schilling","sequence":"additional","affiliation":[{"name":"Breast Imaging, Lynn Women's Health and Wellness Institute, Boca Raton, Florida, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2021,4,8]]},"reference":[{"key":"2025082706464107000_14.4.e241361.1","doi-asserted-by":"crossref","first-page":"1157","DOI":"10.2214\/AJR.13.10930","article-title":"The ABCs of accessory breast tissue: basic information every radiologist should know","volume":"202","author":"DeFilippis","year":"2014","journal-title":"AJR Am J Roentgenol"},{"key":"2025082706464107000_14.4.e241361.2","doi-asserted-by":"crossref","DOI":"10.1177\/000313480407000409","article-title":"Lobular carcinoma in ectopic axillary breast tissue","volume":"70","author":"Giron","year":"2004","journal-title":"Am Surg"},{"key":"2025082706464107000_14.4.e241361.3","doi-asserted-by":"publisher","DOI":"10.1097\/01.ede.0000072105.39021.6d"},{"key":"2025082706464107000_14.4.e241361.4","doi-asserted-by":"publisher","DOI":"10.1093\/jnci\/djp181"},{"key":"2025082706464107000_14.4.e241361.5","unstructured":"Townsend CM , Beauchamp RD , Evers BM . 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