TOPICS: Urothelial carcinoma, transitional cell carcinoma, cigarette, naphthylamine, phenacetin, cyclophosphamide, azo dyes, rubber, plastic, leather, flat tumors, high grade, p53, low grade, papillary tumors, squamous cell carcinoma of bladder, squamous metaplasia, chronic cystitis, schistosoma haematobium, adenocarcinoma of bladder, urachal remnant, dome of bladder, cystitis glandularis, exstrophy