This paper reports 17 cases of adrenal "incidentaloma", discovered by B-mode ultrasonography, computed tomography and/or magnetic resonance imaging scan and identified by operation and pathological examination. Seven of them were pathologically diagnosed as adrenocortical adenoma, 4 pheochromocytoma, 2 adrenal cyst, and 1 mixed cell adenoma, 1 leiomyoma, 1 adrenocortical carcinoma, and 1 gangliocytoma. Adrenal shows hormone-secreting function in 17 patients with adrenal "incidentaloma". The diagnosis and management of this disorder are discussed.