Fig. 1

Classification of the medial and lateral renal tumor using coronal section figures of the kidney. (A, B) The medial renal tumor was defined as a tumor where the central line of the tumor is medial to the central line of the kidney on a preoperative CT image. (C) The lateral renal tumor was defined as a tumor where the central line of the tumor is lateral to the central line of the kidney on a preoperative CT image.