[Malignant degeneration of congenital dystopic testes]

About 0.004 percent of the male population were found to suffer from malignant tumors of testicles annually, with undescended testicles being at higher cancer risk than orthotopic ones. An overall statistical analysis of 1,458 cases of congenitally undescended, malignantly degenerated testicles of adults has revealed that 63.18 percent of the patients never underwent drug treatment, while 10.07 percent were treated without success. The remaining 26.73 percent of the patients underwent largely incompetent operations in late adolescence. Six own observations are described briefly. It is recommended to treat congenitally dystopic testicles already in early childhood, which will largely eliminate malignant degeneration of undescended testicles.