1. What is Prostate Ellipsoid Volume (Cheng Method)?

Definition: This calculator estimates prostate volume using the ellipsoid formula (π/6 × L × W × H), commonly known as the Cheng method.

Purpose: It helps urologists and medical professionals assess prostate size for diagnostic and treatment purposes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — Prostate volume (cubic centimeters)
• \( L \) — Length (cm)
• \( W \) — Width (cm)
• \( H \) — Height (cm)

Explanation: The prostate is modeled as an ellipsoid, and its volume is calculated using the three orthogonal dimensions typically obtained from ultrasound or MRI.

3. Importance of Prostate Volume Calculation

Details: Prostate volume assessment is crucial for diagnosing benign prostatic hyperplasia (BPH), planning surgical interventions, and evaluating prostate cancer risk.

4. Using the Calculator

Tips: Enter the three prostate dimensions (length, width, height) in centimeters as measured by imaging. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why use the ellipsoid formula instead of prolate ellipsoid?
A: The Cheng method (π/6) is simpler and shows good correlation with actual prostate volumes in clinical practice.

Q2: How accurate is this method?
A: While not as precise as volumetric measurements from MRI, it provides a reliable estimate with about 10-15% margin of error.

Q3: What's a normal prostate volume?
A: Typically 20-30 cm³ in young men, often increasing with age (may exceed 40 cm³ in BPH).

Q4: Can I use this for post-TURP measurements?
A: Yes, but note the formula assumes an ellipsoid shape which may be less accurate after surgical modifications.

Q5: How do the dimensions correspond to ultrasound views?
A: Length is sagittal, width is transverse, and height is anterior-posterior dimension on TRUS.