1. Hammarstedt L, Muth A, Wängberg B, Björneld L, Sigurjónsdóttir HA, Götherström G, Almqvist E, Widell H, Carlsson S, Ander S, Hellström M (2010) Adrenal Study Group of Western Sweden. Adrenal lesion frequency: A prospective, cross-sectional CT study in a defined region, including systematic re-evaluation. Acta Radiol 51:1149–1156
2. Mantero F, Terzolo M, Arnaldi G, Osella G, Masini AM, Alì A, Giovagnetti M, Opocher G, Angeli A (2000) A survey on adrenal incidentaloma in Italy. Study Group on Adrenal Tumors of the Italian Society of Endocrinology. J Clin Endocrinol Metab 85:637–644
3. Abrams HL, Spiro R, Goldstein N (1950) Metastases in carcinoma; analysis of 1000 autopsied cases. Cancer 3:74–85
4. Copeland PM (1983) The incidentally discovered adrenal mass. Ann Intern Med 98:940–945
5. Hammarstedt L, Muth A, Sigurjónsdóttir HÁ, Almqvist E, Wängberg B, Hellström M (2012) Adrenal Study Group of Western Sweden. Adrenal lesions in patients with extra-adrenal malignancy—benign or malignant? Acta Oncol 51:215–221