Table 2.
Results of qualitative MRI analysis of the tumors
| Oncocytoma | Chromophobe RCC | P | |
|---|---|---|---|
| Mean tumor diameter (mm) | 60.6±47.3 | 61.7±45.9 | 0.93a |
| Central scars, n (%) | 9 (52.9) | 11 (33.3) | 0.18b |
| Mean scar diameter (mm) | 39.2±36.9 | 25. 4±12.1 | 0.31c |
| Scar intensities* | Hyperintense: 9 (100) Hypointense: 0 (0) |
Hyperintense: 9 (81.8) Hypointense: 2 (18.2) |
0.14b |
| RENAL scores | 7.7±1.7 | 8.2±2.3 | 0.39c |
| Tumor growth pattern | Exophytic: 15 (88.2) Endophytic: 2 (11.8) |
Exophytic: 27 (81.8) Endophytic: 6 (18.2) |
0.55b |
| Tumor signal homogeneity* | Homogeneous: 2 (11.8) Heterogeneous: 15 (88.2) |
Homogeneous: 12 (36.4) Heterogeneous: 21 (63.6) |
0.065b |
| Tumor T2 signal intensity compared to renal parenchyma** | Hyperintense: 7 (41.2) Hypo/isointense: 10 (58.8) |
Hyperintense: 3 (9.1) Hypo/isointense: 30 (90.9) |
0.007b |
RCC, renal cell carcinoma; RENAL, Radius, Exophytic/endophytic properties, Nearness of tumor to the collecting system or sinus in millimeters, Anterior/posterior, Location relative to polar lines.
*
Both T2-weighted images (fast spin-echo and fat saturated T2-weighted images).
**
Fast spin-echo T2-weighted images.
a
Student t test;
b
Chi-square test;
c
Mann-Whitney U test.