Five-year register and multicenter study for testicular tumours Bonn.

Register and Multicenter Study for Testicular Tumours Bonn was founded in September 1976. Until August 1981, from 46 institutions participating in Austria and the Federal Republic of Germany the data from a total of 1508 patients with testicular tumours have been collected and evaluated. This paper gives an overview on the data available at the moment, and especially informations on the age distribution (children 3.6%, men over 50 years 6.3%), predisposing factors (maldescensus testis 8%, atrophy 6%), masking factors (hydrocele 7%, trauma 7%) and duration of anamnesis (average 136 days).