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WHO 1973 and 2004 malignancy grading system for bladder urothelial cancer malignant
| WHO 1973 grading system | WHO 2004 grading system | |
| Papilloma | Papilloma | |
| Grade 1: Highly differentiated | Low-grade urothelial papilloma with malignant potential | |
| Grade 2: Moderately-differentiated | Low-grade papillary urothelial carcinoma | |
| Grade 3: Poorly-differentiated | High-grade papillary urothelial carcinoma |
