Adrenal incidentaloma refers to the casual detection of an adrenal lesion during imaging performed for reasons unrelated to adrenal disease. There is large consensus that this definition applies to adrenal nodules of at least 1 cm.
In routine clinical practice, the prevalence of adrenal incidentaloma in upper abdominal CT scanning is around 1% in young individuals and higher in older individuals (i.e., 3% at 50 years of age and up to 15% after 70 years of age).