Varicocele is a dilatation of the spermatic veins, particularly on the left side, and represents one of the most frequent causes of male infertility. Its frequency in pre-adolescence varies from 10% to 15%. Even today varicocele pathogenesis is not clear. In the period from August 1990 to August 1999, 35 males between 10 and 16 years of age were treated surgically in our Institution via interruption of the internal spermatic vein using Palomo's technique. Patients that reached the age of 18 after surgery have had a spermiogramm. The problem of varicocele therapy in pre-adolescence has not yet been resolved with regard to surgical therapy and follow-up.