Preoperative CT and intraoperative imaging examination. a Plain scan showed a heterogeneous mass about 175 × 130 mm in size on the right kidney, with multiple low-density shadows and nodular calcification. b Significant enhancement of the arterial mass. c The mass density is relatively low compared with the parenchyma of the venous stage. d Coronal mass. e A mass on the sagittal plane. CT, computed tomography.