Bladder - Prostatic-type polyps

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Bladder

Nonurothelial benign tumors

Prostatic-type polyps

Reviewer: Tom Tong, M.D. (see Reviewers page)
Revised: 9 February 2013, last major update May 2010
Copyright: (c) 2003-2013, PathologyOutlines.com, Inc.

Definition
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● Polyps similar to those in prostatic urethra
● Initially described in 1984 (Am J Surg Pathol 1984;8:833)
● See also ectopic prostate

Terminology
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● Adenomatous polyp or papillary adenoma with prostatic type epithelium

Epidemiology
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● Uncommon
● Mean age 46-50 years

Sites
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● Usually around bladder neck or ureteral orifices

Etiology
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● Most likely a type of metaplasia; may be due to injury
● Cases near ureteral orifices occur at younger age (mean 21 years), and may represent a developmental anomaly (Histopathology 1987;11:789)

Clinical features
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● Frequent cause of hematuria in young adults

Case reports
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● 35 year old man with a 2 month history of urine retention, voiding difficulty, frequency and dysuria (Eur Radiol 2003;13:L105)
● 58 year old man with gross hematuria (Hinyokika Kiyo 1990;36:1463)

Treatment
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● Resection or biopsy and fulguration (Int Urol Nephrol 1997;29:313)

Gross description
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● Papillary or polypoid

Micro description
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● Fibrovascular polyp lined by predominantly prostatic-type epithelium with foamy, faintly eosinophilic cytoplasm, with interspersed urothelium
● Cystitis glandularis often present

Micro images
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AFIP Fig 3-6: prostatic polyp of urethra

Cytology description
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● Clusters of benign columnar cells (Diagn Cytopathol 2003;29:356)

Positive stains
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● PAP, PSA

Differential diagnosis
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● Ectopic prostate: no grossly noted polyp or fibrovascular core
● Polypoid cystitis: chronically inflamed bladder with grossly noted polypoid lesions (with edema) or papillary lesions; no prostate-type epithelium

End of Bladder > Nonurothelial benign tumors > Prostatic-type polyps

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