The most common malignant lesion of the adrenal gland is metastatic carcinoma. In a review of all adrenal lesions found on CT in 5 years at a single institution, over 50% were obvious metastasis.4 Adrenal adenoma is a common benign lesion of the adrenal gland. Adrenocortical carcinoma and malignant pheochromocytoma of the adrenal gland are far less common than metastatic cancer.
REFERENCE 4. Herrera MF, Grant CS, van Heerden JA, et al. Incidentally discovered adrenal tumors: an institutional perspective. Surgery 1991;110:1014-21.