preferred_name: Cystic renal lesion that is simple appearing (bosniak i or ii) , or adrenal lesion less than or equal to 1.0 cm or adrenal lesion greater than 1.0 cm but less than or equal to 4.0 cm classified as likely benign by unenhanced ct or washout protocol ct, or mri with in- and opposed-phase sequences or other equivalent institutional imaging protocols