Table 3

Distribution of cases by the two grade system9 and 1998 WHO/ISUP10 criteria

1998 WHO/ISUP
Low grade/high gradePapillomaPNLMPLCPUCHGPUCN (%)
HGPUC, high grade papillary urothelial carcinoma; ISUP, International Society of Urologic Pathology; LGPUC, low grade papillary urothelial carcinoma; PNLMP, papillary neoplasms of low malignant potential; WHO, World Health Organisation.
Papilloma20002 (1%)
Low grade161121098245 (76%)
High grade04323773 (22%)
N (%)18 (5%)116 (36%)141 (44%)45 (14%)320 (100%)