Incidental adrenal masses:
May be seen in as many as 10% of abdominal CT studies. Most commonly represent pheochromocytoma; adrenocoical adenoma, adrenocoical carcinoma, and metastases from other primary cancers occur less frequently. May represent adrenocoical carcinoma if greater than 6 cm. in diameter. Should be routinely evaluated by measurement of 24-hour urine levels of catecholamines and their metabolites, coisol, and aldosterone plus fine-needle aspiration.