Malignant nonfunctional adrenal tumors were always greater than 7cm while incidentally discovered nonfunctional masses were usually less than 5cm and mostly benign.

• 原发于肾上腺的非功能性恶性肿瘤都大于7cm,而偶然发现的非功能性肾上腺肿瘤大多小于5cm,而为良性。