MSK Prostate Size Calculator

Prostate Volume Formula:

\[ V = \frac{\pi}{6} \times L \times W \times H \]

Prostate Volume (cm³):

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1. What is the MSK Prostate Size Calculator?

Definition: This calculator estimates prostate volume using the ellipsoid formula from Memorial Sloan Kettering Cancer Center (MSKCC).

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

2. How Does the Calculator Work?

The calculator uses the ellipsoid formula:

\[ V = \frac{\pi}{6} \times L \times W \times H \]

Where:

\( V \) — Prostate volume (cm³)
\( L \) — Length (cm)
\( W \) — Width (cm)
\( H \) — Height (cm)

Explanation: The formula approximates the prostate as an ellipsoid and calculates its volume using the three orthogonal measurements.

3. Importance of Prostate Volume Calculation

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

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What imaging modalities can provide these measurements?
A: Transrectal ultrasound (TRUS), MRI, and CT scans can all provide the necessary measurements.

Q2: What is a normal prostate volume?
A: Typically 20-30 cm³ in young men, often increasing with age (may reach 40-60 cm³ in BPH).

Q3: How accurate is this estimation method?
A: The ellipsoid formula provides a good approximation, though actual volume may vary by ±10-15%.

Q4: Can this calculator estimate prostate weight?
A: Yes, prostate weight in grams is approximately equal to volume in cm³ (density ~1.05 g/cm³).

Q5: Why is π/6 used in the formula?
A: This is the geometric constant for volume calculation of an ellipsoid (π/6 ≈ 0.52).