Radiology Site

Adrenal Washout Calculator

CT Characterization of Adrenal Masses

1. Non-Contrast (Unenhanced)

If ≤ 10 HU, lesion is likely lipid-rich.

2. Enhanced (Portal Venous)

Typically 60–70 seconds post-injection.

3. Delayed (15 Minutes)

Diagnosis

—

Absolute (AWO)

–%

Threshold: ≥ 60%

Relative (RWO)

–%

Threshold: ≥ 40%

Calculation assumes standard adrenal CT protocol.
Clinical correlation required.

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