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[So-called benign papilloma of the bladder. A retrospective study].

A retrospective study of 34 patients with histologically verified, so called "benign" papilloma of the mucuous membrane of the urinary bladder (pTa GO) served as a basis for investigation of the course of the condition, the tendency to recurrence and the development of carcinoma. A histologically identical recurrent tumour was found in 53% of the patients, while 85% developed a urothelial carcinoma in a period of between 1 and over 10 years. From the time of the diagnosis of papilloma, the 5-year survival rate was 87% and the 10-year survival rate was 76%. From the time of the carcinoma diagnosis the 5-year survival rate was 40%, none of the patients survived 10 years.