RT Book, Section A1 Fitzgerald, Paul A. A2 Papadakis, Maxine A. A2 McPhee, Stephen J. A2 Rabow, Michael W. A2 McQuaid, Kenneth R. SR Print(0) ID 1193160902 T1 Incidentally Discovered Adrenal Masses T2 Current Medical Diagnosis & Treatment 2023 YR 2023 FD 2023 PB McGraw-Hill Education PP New York, NY SN 9781264687343 LK accessmedicine.mhmedical.com/content.aspx?aid=1193160902 RD 2024/03/28 AB Adrenal incidentalomas are defined as adrenal nodules that are discovered incidentally on abdominal imaging obtained for other reasons. Their incidence increases with age, being found on 1–7% (average 4%) of all CT or MRI scans. About 75% are nonfunctioning adrenal adenomas; however, 14% secrete increased cortisol or aldosterone, resulting in Cushing syndrome or aldosteronism, respectively, and 7% are pheochromocytomas. Another 4% of incidentalomas represented metastases or adrenal adenocarcinomas. The differential diagnosis for incidentally discovered adrenal masses also includes adrenal infection, hemorrhage, and cysts.