Adrenal mass. Adrenal protocol CT. >10 HU.
What are the enhancement and washout characteristics of this mass?
What are the enhancement and washout characteristics of this mass?
APW <60% or RPW <40%.
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Note:
No enhancement is defined as change in pre- and postcontrast imaging of <10 HU.
APW(absolute percentage washout) values are calculated using the formula (enhanced HU – 15-min delayed HU)/(enhanced HU – unenhanced HU) X 100%.
RPW(relative percent washout, used when unenhanced CT not available) values are calculated using the formula (enhanced HU – 15-min delayed HU)/enhanced HU X 100%.