Table 2. Quantitative MRI lesion analysis.
| MRI features | sRCC | ccRCC | P |
|---|---|---|---|
| Mean signal T1 corticomedullary enhancement/T1 pre-cortex | 1.45 | 1.65 | 0.18 |
| Mean signal T2 mass/T2 contra cortex | 0.86 | 1.11 | 0.024* |
| % mass with T2 signal < contra renal cortex | 0.62 | 0.39 | 0.025* |
| Mean ADC values (×10−3 mm2/s) | 1.265±1.88 | 1.563±1.95 | 0.005* |
| Average MRI%SARC | 17.8±11.0 | 1.7±1.8 | <0.001* |
*, significant difference. RCC, renal cell carcinoma; ADC, apparent diffusion coefficient; MRI%SARC, volume fraction of sarcomatoid involvement within a tumor defined by MRI; MRI, magnetic resonance imaging; ccRCC, clear cell renal cell carcinoma; sRCC, sarcomatoid differentiation in renal cell carcinoma.