Adrenal tumors, including adrenocortical tumors and pheochromocytomas, it is very difficult to predict the malignant potential using either clinical or morphological ground.

• 肾上腺肿瘤，包括皮质肿瘤和髓质肿瘤，有时通过临床和形态学也很难确定其良恶性质。