Type of incidentaloma*	Findings
	Size	Attenuation on unenhanced CT	Rapidity of washout of contrast media on enhanced CT	Appearance on MRI (out-of-phase image)	Growth rate
Lipid-rich adrenal adenoma	< 3 cm	≤ 10 HU	Rapid washout	Signal loss	Size usually stable
Lipid-poor adrenal adenoma	< 3 cm	> 10 HU	Rapid washout	No signal loss	Size usually stable
Adrenocortical carcinoma	Usually > 5 cm	> 10 HU	No rapid washout	No signal loss	Usually significant growth
Pheochromocytoma	Variable size	> 10 HU	No rapid washout	No signal loss	Slow growth
Metastasis	Variable size	> 10 HU	No rapid washout	No signal loss	Usually significant growth