Vulva, vagina & female urethra


Ectopic mammary tissue

Topic Completed: 1 February 2013

Minor changes: 4 February 2021

Copyright: 2002-2021,, Inc.

PubMed Search: Vulva ectopic mammary tissue

Monika Roychowdhury, M.D.
Page views in 2020: 1,849
Page views in 2021 to date: 1,758
Cite this page: Roychowdhury M. Ectopic mammary tissue. website. Accessed October 15th, 2021.
Definition / general
  • Occurs along primitive milk line, from axilla to groin; may be source of papillary hidradenoma
  • Considered by some as normal constituent of anogenital area (Adv Anat Pathol 2011;18:1)
  • Excision recommended to prevent development of same benign or malignant processes seen in ordinary breast tissue (Obstet Gynecol 2011;118:478)
Proposed criteria for primary breast carcinoma in vulva
  • Histology consistent with breast carcinoma
  • Nonneoplastic breast tissue or DCIS present in vulva
  • Supportive immunohistochemistry (ER+, PR+, GCDFP-15+, HER2+)
  • No carcinoma in ordinary breast tissue or other organs
  • Inability to locate other primary carcinoma of vulvar glands or skin appendages
Case reports
Clinical images

Case #273

Case #273

Microscopic (histologic) images

Case #273

Case #273

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Vulvar lactating adenoma

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