An anastomosis between the left renal and left ascending lumbar veins may appear as a mass on CT scans due to a varicosity where the veins separate. Intravenous injection of contrast material reveals the vascular nature of the mass.

CT was performed before and after lymphadenectomy in 105 patients with early stage non-seminomatous testicular tumor. Retroperitoneal blurring and retracted bowel were the most common findings and might cause interpretation problems. A reference CT making future comparison possible should be routinely performed two months after the operation.Retroperitoneal lymphadenectomy is widely used for pathologic staging and treatment of non-seminomatous germ cell tumors ofthe testis 0, 3,4,6,8,9,