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Prostate capsule: computerized morphometric analysis of its components

A A Sattar1, J C Noël, J J Vanderhaeghen

  • 1Department of Urology, Erasme Hospital, University Clinics of Brussels, Belgium.

Urology
|August 1, 1995
PubMed
Summary
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The prostate capsule lacks distinct smooth muscle fibers (SMFs) and is not a true capsule. This fibromuscular band is likely an extension of the prostate parenchyma itself.

Area of Science:

  • Urology
  • Surgical Pathology
  • Anatomy

Background:

  • The precise anatomical and histological definition of the prostate capsule remains unclear.
  • Objective quantification of smooth muscle fiber (SMF) content in the prostate capsule is lacking.

Purpose of the Study:

  • To objectively quantify the percentage of smooth muscle fibers (SMFs) in the prostate capsule using computerized image analysis.
  • To determine if the prostate possesses a distinct capsule or a fibromuscular band.

Main Methods:

  • Analysis of ten radical prostatectomy specimens.
  • Examination of six distinct regions from each prostate lobe.
  • Utilized hematoxylin and eosin, Masson's trichrome, and anti-actin immunohistochemical staining for SMF identification.

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Main Results:

  • The prostate capsule thickness ranged from 0.5 to 2 mm.
  • The mean SMF percentage in the prostate capsule was 30.6%.
  • No significant difference in SMF percentage was observed between the capsule and the prostate parenchyma (30.7%).

Conclusions:

  • The study provides objective evidence that the prostate does not have a true capsule.
  • The so-called prostate capsule is a fibromuscular band.
  • This band is likely an extension of the internal prostate parenchyma.