There are two adrenal glands in the body, one on top of each kidney. The adrenal glands make hormones that regulate the body’s metabolism, response to stress, and water/salt balance. Adrenal adenomas are benign (non-cancerous) tumors found in all age groups and increase in frequency with age. The majority (about 95%) of adrenal adenomas are non-functioning (do not produce hormones), in which case they are asymptomatic (do not cause symptoms). In all cases, but especially in the setting of known current or previous malignancy, adrenal adenomas should be fully evaluated.