[Multicentricity of urothelial tumors of the efferent urinary tracts].

On the basis of 8 cases with primary urothelial tumours of the upper efferent urinary tract with simultaneously only partly preoperatively diagnosed secondary tumours of the urothelium the problems of diagnostics and therapy are discussed. A conservative surgery may be regarded as sufficiently radical only then when a multicentric genesis may be excluded with certainty. In our patients with tumours of the upper efferent urinary tract we found a multicentricity in 18.4%.