Although benign adenomas are overwhelmingly the most common adrenal nodule encountered in the general population, the possibility of other pathologic entities (including pheochromocytoma, adrenocortical carcinoma, and metastatic disease) requires that radiologists develop an approach to the characterization of adrenal lesions. The prevalence of adrenal incidentalomas increases with age fewer than 0.5% of adrenal nodules are discovered in patients in their 20s compared with up to 7% in patients older than 70 years old.
Incidental adrenal nodules are detected in approximately 4–5% of patients undergoing CT examinations.
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