Adrenal washout
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Adrenal washout can be calculated using the density value of an adrenal mass on non-enhanced, portal venous phase and 15 minutes delayed CT-scans (density measured in Hounsfield units (HU). It is primarily used to diagnose adrenal adenoma.
- absolute washout
- [(HUportal venous phase) - (HUdelayed)] / [(HUportal venous phase) - (HUnon-enhanced)] x 100
- >60% washout is highly suggestive of adrenal adenoma
- relative washout
- [(HUportal venous phase) - (HUdelayed)] / (HUportal venous phase) x 100
- >40% washout is highly suggestive of adrenal adenoma
PheochromocytomasPhaeochromocytomas may also wash out, but should have a different clinical presentation. They also may have a higher absolute attenuation on the contrast phase (arterial or portal venous) and any adrenal lesion >120 HU with washout should not be diagnosed as an adenoma.
Online calculators
-<p><strong>Adrenal washout</strong> can be calculated using the density value of an adrenal mass on non-enhanced, portal venous phase and 15 minutes delayed CT-scans. It is primarily used to diagnose <a href="/articles/adrenal-adenoma">adrenal adenoma</a>.</p><ul>- +<p><strong>Adrenal washout</strong> can be calculated using the density value of an <a title="Unilateral adrenal mass" href="/articles/adrenal-lesions-differential">adrenal mass</a> on non-enhanced, portal venous phase and 15 minutes delayed <a title="CT" href="/articles/computed-tomography">CT-scans</a> (density measured in <a title="Hounsfield unit" href="/articles/hounsfield-unit">Hounsfield units </a>(HU). It is primarily used to diagnose <a href="/articles/adrenal-adenoma">adrenal adenoma</a>.</p><ul>
-</ul><p><a href="/articles/pheochromocytoma-2">Pheochromocytomas</a> may also wash out, but should have a different clinical presentation. They also may have a higher absolute attenuation on the contrast phase (arterial or portal venous) and any adrenal lesion >120 HU with washout should not be diagnosed as an adenoma.</p><h5>Online calculators</h5><ul>- +</ul><p><a href="/articles/pheochromocytoma-2">Phaeochromocytomas</a> may also wash out, but should have a different clinical presentation. They also may have a higher absolute attenuation on the contrast phase (arterial or portal venous) and any adrenal lesion >120 HU with washout should not be diagnosed as an adenoma.</p><h5>Online calculators</h5><ul>
-<li><a title="https://www.easycalculation.com/medical/adrenal-washout-calculator.php" href="https://www.easycalculation.com/medical/adrenal-washout-calculator.php">https://www.easycalculation.com/medical/adrenal-washout-calculator.php</a></li>- +<li><a href="https://www.easycalculation.com/medical/adrenal-washout-calculator.php">https://www.easycalculation.com/medical/adrenal-washout-calculator.php</a></li>
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