Adrenal adenomas of several centimeters may or may not require surgery. The need for surgery should be discussed according to the type of adenomas such as benign adrenal adenomas, adrenal pheochromocytomas, and adrenocortical carcinomas, rather than the size of the adrenal adenomas. 1. Benign adrenal adenomas: These benign tumors are divided into two categories: functional adrenal adenomas, which should be surgically removed regardless of their size, and non-functional adrenal adenomas, which are larger than 2 cm in size, can be considered for surgical removal. 2. Pheochromocytoma and adrenocortical carcinoma of the adrenal gland: These two types of tumors, the former with malignant potential and the latter malignant, should be surgically resected as soon as possible regardless of the size once discovered to avoid further development of the tumor. Patients with adrenal adenomas should go to the hospital for examination to determine the benign or malignant nature of the adenomas as well as the size of the adenomas, and then choose surgical treatment or conservative treatment under the guidance of doctors.