A case of adrenocortical oncocytic neoplasm treated with laparoscopic adrenalectomy

A 32-year-old woman who was followed for mammary adenoma every six months was found to have a left adrenal tumor on ultrasound examination in August 2016. She had no complaints and no abnormalities on physical examination. Blood analyses, including biochemical test and endocrinological test, were within normal values. However, 24-h urine collection showed modest elevation of catecholamines except for adrenaline and metanephrine. CT and MRI showed a round left adrenal mass, with a diameter of 54 mm (Fig. 1). 123I-adosterol scintigraphy showed no uptake in the tumor. We suspected the tumor of a paraganglioma with low endocrine activity or a malignant adrenal tumor based on these radiological examinations. Laparoscopic left adrenalectomy was performed with a transperitoneal approach. During the operation, the patient's blood pressures and heart rates were within normal ranges. Macroscopic examination showed that the color of the divided surface was mahogany. On microscopic examination, the tumor had a capsule and was well-circumscribed,