Classification of renal tumours
| Question | % | Number |
| If you would find new entities not included in the WHO 2004 classification, would you report them by their proposed names? | ||
| Yes | 80.7 | 130/161 |
| No, would report as unclassified | 19.3 | 31/161 |
| Do you consider a tumour sarcomatoid if: | ||
| It has a spindle cell pattern | 50.9 | 81/159 |
| It is very atypical and looks like any type of sarcoma | 49.1 | 78/159 |
| Do you recognise early sarcomatoid change (elongation of epithelial cells) as sarcomatoid carcinoma? | ||
| Yes | 28.8 | 45/156 |
| No | 71.2 | 111/156 |
| How are sarcomatoid carcinomas reported? | ||
| Unclassified carcinoma | 0.0 | 0/160 |
| Unclassified carcinoma but mention sarcomatoid component | 10.0 | 16/160 |
| If evidence of another histological type, this type is diagnosed with sarcomatoid transformation | 90.0 | 144/160 |
| Are small papillary tumours | ||
| Considered malignant if diameter >2 mm | 3.8 | 6/159 |
| Considered malignant if diameter >5 mm | 55.3 | 88/159 |
| Considered malignant if diameter >10 mm | 5.7 | 9/159 |
| Only if nuclear grade sufficiently high | 9.4 | 15/159 |
| Called papillary tumour with size reported | 25.8 | 41/159 |
| Do you report papillary microadenomas incidentally found in nephrectomy specimens? | ||
| Yes | 96.3 | 157/163 |
| No | 3.7 | 6/163 |
| Do you subtype papillary RCC as type I or II? | ||
| Yes | 86.5 | 141/163 |
| No | 13.5 | 22/163 |
RCC, renal cell carcinoma.