Figure 2a. Clear cell sarcoma of the kidney. (a) Coronal, gadolinium-enhanced, fat-saturated, two-dimensional gradient-echo magnetic resonance (MR) image shows a large, heterogeneous, expansile mass in the right kidney (arrows). (b) Coronal, T1-weighted gradient-echo MR image shows bone metastases from clear cell sarcoma of the kidney that involve both femurs (arrows).