Figure 4a:

Papillary renal cell carcinoma (RCC). (a) Coronal non–fat-saturated T2-weighted single-shot fast spin-echo MR image shows a low-signal-intensity lesion (arrow). (b) Coronal T1-weighted fat-saturated spoiled-gradient recalled echo MR images show this same lesion with signal intensity analogous to that of the renal cortex, with low contrast enhancement on both corticomedullary and nephrographic phases (*) when compared with renal cortex enhancement. Pathologic analysis revealed papillary-type RCC.