Vulva, vagina & female urethra


Mammary/mammary-like tissue and associated lesions

Last author update: 1 February 2013
Last staff update: 10 January 2022

Copyright: 2002-2023,, Inc.

PubMed Search: Vulva ectopic mammary tissue

Monika Roychowdhury, M.D.
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Cite this page: Roychowdhury M. Mammary/mammary-like tissue and associated lesions. website. Accessed September 30th, 2023.
Definition / general
  • Occurs along primitive milk line, from axilla to groin; may be source of papillary hidradenoma
  • Mammary-like anogenital glands are now considered a normal constituent of the perineum rather than ectopic tissue (Adv Anat Pathol 2011;18:1)
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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