Reviewing the contemporary therapy of vesical tumour, the authors point to the basic principles that govern the daily practice, the precise application of which may go a long way to improving the results. Not ignorable is the experience that one part of these tumours defies discovery by multifocal and cystoscopic examination. The fundamental tenet of tumour surgery to remove the tumour by incision into sound tissue, must be respected. A brief review is given of the main lines that promise headway in dealing with the disease.