A 46-year-old woman experienced mild epigastral discomfort. Physical and laboratory examination revealed no special abnormal findings. But Ultrasonography of the left kidney demonstrated multiple anechoic tubular structures in central region and dilated renal vein at the renal hilum. A diagnosis of an Arteriovenous Malformation was confirmed by renal angiography. These ultrasonic appearance were believed characteristic of Renal Arteriovenous Malformation.