1. What is the Philip Cheng Prostate Volume Calculator?

Definition: This calculator estimates prostate volume using the ellipsoid formula (Cheng method) based on length, width, and height measurements.

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

2. How Does the Calculator Work?

The calculator uses the ellipsoid formula:

Where:

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

Explanation: The formula approximates the prostate as an ellipsoid shape, multiplying the three orthogonal dimensions by π/6.

3. Importance of Prostate Volume Measurement

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

4. Using the Calculator

Tips: Enter the prostate dimensions in centimeters as measured by transrectal ultrasound (TRUS) or MRI. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the clinical significance of prostate volume?
A: Volume helps assess BPH severity, predict urinary symptoms, and guide treatment decisions (medication vs. surgery).

Q2: How accurate is the ellipsoid formula?
A: It provides a good estimate (within 10-15% of actual volume) for regularly shaped prostates.

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

Q4: When would more precise methods be needed?
A: For irregularly shaped prostates or precise surgical planning, planimetry (3D reconstruction) may be preferred.

Q5: How does this relate to PSA levels?
A: PSA density (PSA/volume) helps distinguish BPH from prostate cancer, with higher densities suggesting cancer.