[Diagnosis and treatment of three cases of adrenocortical oncocytoma and a literature review].

To investigate the diagnosis and surgical treatment of adrenocortical oncocytoma. The clinical data from three cases of adrenocortical oncocytomas (ACOs) were retrospectively analyzed and discussed in light of the relevant literature. In these three cases, one presented with virilization, while the other two cases had no typical clinical features. The tumor was completely encapsulated and was non-invasive. Microscopically, the tumor cells showed neither mitosis nor necrosis, with abundant eosinophilic cytoplasm. No recurrence or metastasis was discovered after close follow-up observation for 12-24 months. Adrenocortical ACOs are rather rare, and most of them are benign. It was hard to make a confirmed diagnosis of ACOs before surgery. Resection of tumor is the best choice, and close follow-up observation is essential.