Which of the following is not a CT feature ofAdrenal adenoma –
Adrenal adenoma on contrast-enhanced CT/MRI shows rapid uptake and relatively rapid washout of contrast material than do non adenomasQ.
Adenoma: CT features

Well defined/sharply defined 
<5 cm in size
Low attenuation (<10 HU) due to lipid content
Mild homogenous enhancement
Relatively rapid washout of contrast material (due to lack of large interstitial spaces
Relatively rapid washout is characteristic of adenoma
Low attenuation
Homogenous density and well defined borders
Enhances rapidly, contrast stays in it for a relatively longer time and washes out late
Calcification is rare