Prostate
Microscopic mimics of prostatic carcinoma
Cowper's glands

Author: Andres Matoso, M.D. (see Authors page)

Revised: 22 July 2016, last major update July 2015

Copyright: (c) 2003-2016, PathologyOutlines.com, Inc.

PubMed Search: Cowper's glands [title]
Cite this page: Cowper's glands. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/prostatecowpers.html. Accessed December 10th, 2016.
Definition / General
  • Cowper's glands are also called bulbourethral glands because they are located surrounding the bulbar portion of the urethra, outside of the prostate
Epidemiology
  • Most commonly, they can be found in TURP specimens, but occasionally they may be seen in needle biopsies or in biopsies from urethral stricture
Sites
  • Bulbar urethra
Pathophysiology
  • They are the homologous of Bartholin's glands in women
  • They secrete clear fluid prior to ejaculation that helps to lubricate the urethra and a small proportion of the fluid of the ejaculate
Gross Images

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Cowper's gland

Micro Description
  • They are composed of mucinous acini arranged in a lobular pattern with intercalated ducts
  • When present in needle biopsies, they may resemble foamy gland prostate adenocarcinoma
  • They are surrounded by skeletal muscle, further mimicking cancer
  • They can be positive for prostate markers PSA, PSAP and NKX3.1
  • The correct diagnosis lies in recognizing the dual population of acini and ducts surrounded by skeletal muscle as opposed to benign prostatic glands
  • Immunohistochemistry for high molecular weight cytokeratin is positive in basal cells and can help in the differential diagnosis with prostate cancer
Micro Images

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Cowper's glands, various images



Images courtesy of Andres Matoso, M.D.:

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Low power of Cowper's glands

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Glands and skeletal muscle

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Mucicarmin+

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PAS+

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NKX3.1+

Positive Stains
  • By immunohistochemistry, Cowper's glands can be positive for prostate markers PSA, PSAP and NKX3.1
  • Special stains mucicarmin and PAS are also positive
Differential Diagnosis
Additional References