Prostate MRI workflow toolkit

Prostate MRI Toolkit

A quick, browser-based workspace for PSA density calculation, prostate zonal anatomy review, PI-RADS v2.1 assistance, and core references.

For medical education and workflow support only. Final interpretation should be based on the full MRI examination and clinical context.

PSA DensityProstate axial vectorPro

Enter prostate dimensions and PSA to generate a dictation-ready prostate volume and PSA density line.

Use automatic selection by size threshold, or override manually based on gland shape.
The prostate measures __ x __ x __ cm (__ cc).
PSA optional
Suggestion (display only; not copied)
Enter measurements and PSA to generate the PSA density statement.
Auto-selection uses bullet volume when the bullet-calculated volume is <55 cc, otherwise ellipsoid volume.
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Created by Nick Shaheen, MD
Medical education note: This tool is intended for medical education and workflow support only. It is not a substitute for clinical judgment, institutional protocols, current guidelines, or formal physician interpretation. PSA density and PI-RADS guidance should be interpreted in the full clinical context.

Prostate Anatomy Overview

Key anatomic zones and MRI interpretation pearls for prostate MRI.

Peripheral Zone (PZ)

  • Largest prostatic zone.
  • Approximately 70% glandular tissue.
  • Most prostate cancers originate in the peripheral zone, approximately 70%.
  • Typically demonstrates high T2 signal intensity unless replaced by tumor or prostatitis.

Transition Zone (TZ)

  • Composed of approximately 60% stromal tissue and 40% glandular tissue.
  • Site of benign prostatic hyperplasia (BPH).
  • Approximately 20% of prostate cancers arise in the transition zone.
  • Can appear heterogeneous due to BPH nodules and stromal hyperplasia.

Central Zone (CZ)

  • Approximately 25% glandular tissue.
  • Only 1–5% of prostate cancers originate in the central zone.
  • Typically symmetric and relatively low T2 signal intensity.
  • Can occasionally mimic malignancy at the prostate base.

Periurethral Zone & Anterior Fibromuscular Stroma

  • Rare site of prostate cancer origin.
  • Predominantly fibromuscular tissue with low T2 signal intensity.
  • The prostate has no true capsule.
  • The so-called capsule represents concentric fibromuscular pseudocapsule.
  • This pseudocapsule is incomplete anteriorly and at the apex.
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References & Sources

Core references for the anatomy, PSA density, and PI-RADS content used in this educational toolkit.

  1. American College of Radiology, European Society of Urogenital Radiology, and AdMeTech Foundation. PI-RADS® v2.1: Prostate Imaging — Reporting and Data System. Version 2.1. 2019.
  2. McNeal JE. The zonal anatomy of the prostate. Prostate. 1981;2(1):35-49. doi:10.1002/pros.2990020105.
  3. Pellegrino F, Vickers AJ, Stabile A, et al. Prostate-specific antigen density cutoff of 0.15 ng/ml/cc to propose prostate biopsies to patients with negative magnetic resonance imaging: efficient threshold or legacy of the past? Eur Urol Open Sci. 2023;47:16-22.
Medical education note: This website is intended for medical education and workflow support only. It is not a substitute for clinical judgment, institutional protocols, current guidelines, or formal physician interpretation.