if HU<15, then STOP --> benign adenoma in all likelihood (They tend to contain fat)
if HU>=15 give contrast and measure HU on two sets of CT images
Then calculate the ratio
(C+ - Cd ) / (C+ - Cp) * 100 to get a percentage.
The percent indicates the washout
If washout < 50% not an adenoma
If washout > 50% adenoma
The idea is that adenoma do not retain the contrast very much over time