Prostate
Microscopic mimics of prostatic carcinoma
Urothelial (transitional) metaplasia

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

Revised: 17 February 2016, last major update February 2016

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

PubMed Search: Urothelial metaplasia [title]
Cite this page: Urothelial metaplasia. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/prostateurothelialmet.html. Accessed December 4th, 2016.
Definition / General
  • Urothelium lining the peripheral glands and ducts of the prostate
Essential Features
  • The epithelium is composed of oval or spindle cells with occasional nuclear groves
  • The urothelial cells may be located underneath the prostatic luminal epithelium
  • Prostatic ducts may also show spread of urothelial carcinoma, but in contrast to urothelial metaplasia, it has high grade nuclear atypia, similar to CIS in the bladder
Epidemiology
  • Urothelial metaplasia can occur at any age
Sites
  • Peripheral prostate acini and ducts
Clinical Features
  • Urothelial metaplasia is a histologic finding and has no clinical manifestations
Diagnosis
  • The diagnosis of urothelial metaplasia is morphologic
Treatment
  • Not required
Gross Description
  • Urothelial metaplasia is not seen grossly
Micro Description
  • The epithelium is composed of oval or spindle cells with occasional nuclear groves
  • Focally, the cells may be oriented longitudinally to the basement membrane
  • The urothelial cells may be located underneath the prostatic luminal epithelium
Micro Images

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Courtesy of Andres Matoso, M.D.



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Urothelial metaplasia in a prostate needle biopsy

Positive Stains
  • Stains positive for urothelial markers include p63, GATA3
Negative Stains
  • Prostate makers: PSA, PSAP, NKX3.1
Differential Diagnosis
  • The main differential diagnosis is with urothelial carcinoma spreading in prostatic ducts
    • In contrast to urothelial metaplasia, urothelial carcinoma is characterized by high grade nuclear atypia