in these cases, a dexamethasone suppression test is often used to detect cortisol excess, and metanephrines or catecholamines for excess of these hormones. tumors under 3 cm are generally considered benign and are only treated if there are grounds for a diagnosis of cushing's syndrome or pheochromocytoma. radiodensity gives a clue in estimating malignancy risk, wherein a tumor with 10 hounsfield units or less on an unenhanced ct is probably a lipid-rich adenoma.