The expert opinion and the rehabilitation of patients with urogenital tumours often render great problems and tasks for the urologist. A schematic invalidisation of these patients is to be refused. The leading idea of an expert opinion should be the rehabilitation. This demands from the expert a judgment of the function with evaluation of the oncological prognosis quoad vitam and a judgment of the remaining functions of the treated organism as well as a recommendation for the further professional activity based on this judgment. A close cooperation with industrial institutions, the factory public health, the medical advisory commissions and the rehabilitation commissions is necessary for rehabilitation. The notion of rehabilitation--professional as well as social--is to be extended to the not unconsiderable number of patients at pensioner's age. The resumption of a suitable work effects in a patient sith successfully treated tumour disease the improvement of the general physico-psychic resistance, increases the will to recovery and activity and furthers the acclimatization and adaptation to remaining disturbances. Thus expert opinion in the sense of rehabilitation is also a therapy. The results of modern tumour therapy should not be measured only at the survival rates, but also at the degree of the social and professional rehabilitation of the patients.