Botty Van den Bruele Astrid, Gemignani Mary L
Breast Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
Breast J. 2020 Oct;26(10):2042-2044. doi: 10.1111/tbj.13973. Epub 2020 Jul 30.
Supernumerary breast components occur predominantly between the breast and umbilicus. Carcinoma of this ectopic, or accessory breast tissue (ABT), is exceedingly rare, accounting for <1% of breast cancer cases. Historically, ectopic breast carcinoma was considered aggressive with poor outcome. In 1995, Evans et al reported 90 cases spanning from 1929 to 1993 with a 9.4% survival beyond 4 years. More contemporary studies reveal improvement in both treatment and survival. There is currently no consensus on whether prophylactic excision of an ipsilateral supernumerary nipple at the time of initial breast cancer diagnosis is necessary. The following describes a patient with an ipsilateral tumor uniquely located within her supernumerary nipple 5 years after mastectomy.
额外乳腺组织主要出现在乳房与脐之间。这种异位或副乳腺组织（ABT）发生癌变极为罕见，占乳腺癌病例的比例不到1%。历史上，异位乳腺癌被认为具有侵袭性，预后较差。1995年，埃文斯等人报告了1929年至1993年间的90例病例，4年以上生存率为9.4%。更多当代研究表明治疗和生存率都有所改善。目前对于在初次乳腺癌诊断时是否有必要对同侧额外乳头进行预防性切除尚无共识。以下描述了一名患者，在乳房切除术后5年，其同侧肿瘤独特地位于额外乳头内。
