Table 1.
Patient clinical characteristics and histologic types
| Parameters | Benign (n = 399) | Malignant (n = 1396) | P value |
|---|---|---|---|
| Age, median (range, years) | 50 (18–84) | 56 (18–86) | < 0.001 |
| Gender, n (%) | < 0.001 | ||
| Female | 273 (68.4) | 418 (29.9) | |
| Male | 126 (31.6) | 978 (70.1) | |
| Laterality, n (%) | 0.480 | ||
| Left | 182 (45.6) | 667 (47.8) | |
| Right | 217 (54.4) | 729 (52.2) | |
| Lesion size, median (range, cm) | 3.9 (0.9–19.3) | 3.5 (0.9–13.9) | < 0.001 |
| CT reported results | < 0.001 | ||
| Malignant | 102 (25.6) | 1146 (82.1) | |
| Equivocal | 47 (11.8) | 211 (15.1) | |
| Benign | 250 (62.7) | 39 (2.8) | |
| Lesion subtype, n (%) | - | ||
| Clear cell RCC | - | 1191 (85.3) | |
| Papillary RCC | - | 51 (3.7) | |
| Chromophobe RCC | - | 78 (5.6) | |
| MiT Family translocation carcinomas | - | 32 (2.3) | |
| Other malignant renal tumor | - | 16 (1.1) | |
| Unclassified RCC | - | 28 (2.0) | |
| Angiomyolipoma | 307 (76.9) | - | |
| Oncocytoma | 18 (4.5) | - | |
| Cyst | 55 (13.8) | - | |
| Other benign renal tumor | 19 (4.8) | - |
Other malignant renal tumors included 4 cases of multilocular cystic RCC, 4 cases of sarcomas, 3 cases of clear cell papillary RCC, 2 cases of well-differentiated neuroendocrine tumors, 1 case of succinate dehydrogenase deficient RCC, 1 case of collecting duct carcinoma, and 1 case of malignant perivascular epithelioid cell tumor. Other benign renal tumors included 6 cases of adult cystic nephroma, 4 cases of juxtaglomerular cell tumor, 3 cases of metanephric adenoma, 2 cases of papillary adenoma, 2 cases of inflammatory myofibroblastic tumors, 1 case of mixed epithelial and stromal tumor, and 1 case of schwannoma
RCC Renal cell carcinoma