Ectopic mammary tissue

Author: Monika Roychowdhury, M.D. (see Authors page)

Revised: 10 August 2018, last major update February 2013

Copyright: (c) 2002-2018,, Inc.

PubMed Search: Vulva ectopic mammary tissue

Page views in 2018: 925
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Cite this page: Roychowdhury, M. Ectopic mammary tissue. website. Accessed January 22nd, 2019.
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

Images hosted on PathOut server:

Case of the Week #273

Microscopic (histologic) images

Images hosted on PathOut server:

Case of the Week #273

Images hosted on other servers:

Mucinous carcinoma

Vulvar lactating adenoma