A patient, aged 28, was admitted to the Department of Urology of the Military Medical Academy in Belgrade, for the operation of the right adrenal gland tumour. The adrenal gland tumour was first diagnosed as an inactive hormonal tumour. Intraoperatively it was found in retroperitoneal area, over the right adrenal gland and the right kidney, near the Cava inferior and under the liver it was extirpated. It was a Castleman's tumour of hyaline-vascular type.