A 56-year-old man with renal cell carcinoma in renal allograft. Findings: Coronal CT of the abdomen with intravenous contrast. Curved MPR reconstruction of delayed image showing normal contrast excretion in the renal allograft with heterogeneously enhancing mass lesion at the upper pole of renal allograft involving PC system in the upper pole renal allograft (white arrow) (Technique: Siemens Somatom sensation 64-slice CT scanner, Coronal CT, KV 120, Eff mAs 105, Slice thickness 5 mm. Contrast: Iohexol 350, 70 mL, Delayed Phase [10 min