Figure 1 CT enhanced imaging results. A-B : A mass at the left renal hilum with slightly lower density, irregular shape, approximately 3.8×2.8 cm in size (At the white arrow). The enhancement scan shows heterogeneous enhancement, with compression of the left renal pelvis. C . CTU showing normal visualization of the renal pelvis and ureter, with no filling defect observed.
MRI findings: A T2-weighted scan showed a 3.6×2.6 cm iso-signal tumor in the left renal sinus with visible fat signals. The tumor was traversed by the lower pole artery of the left kidney. Contrast-enhanced imaging revealed homogeneous enhancement of the tumor’s solid components. The tumor was closely associated with the renal vein. Differential diagnoses included ectopic adrenal gland and angiomyolipoma. Renogram: Severe impairment of perfusion, filtration, and excretion functions in the right kidney, with normal function in the left kidney. The total glomerular filtration rate (GFR) was 81.11 ml/min, with 67.96 ml/min from the left kidney and 13.14 ml/min from the right kidney(Figure 2 ).