Histological Typing of Urinary Bladder Tumours (WHO. World Health Organization. International Histological Classification of Tumours)

This text reflects the revised WHO classification and terminology. One major change is in the introduction of a new category: papillary urothelial neoplasm of low malignant potential. Many of the tumours previously designated as papillary transitional cell carcinoma, grade I now fall into that category. Another major change is in the designation of flat lesions, and this includes a definition of carcinoma in situ. Furthermore, a number of variant forms of urothelials carcinomas are included as well as new entities not recognized when the 1st edition was issued.