The intensity of adjuvant radiotherapy for stage I seminoma could be reduced substantially in recent years, achieving cure with low side effects and a low probability of late complications. Today a dose of 20 Gy is applied to the para-aortic lymphatics. Valuable treatment alternatives to radiotherapy have emerged: surveillance strategy allows 80% of patients to avoid further treatment. However, the remaining 20% will be exposed to potentially more intensive salvage therapy. Adjuvant carboplatinum chemotherapy offers similar disease-free survival to adjuvant radiotherapy. Long-term experience with late toxicity is not available. In seminoma CS IIA/B curative irradiation remains the standard treatment. Brain metastases of testicular germ cell tumors are treated with a combination of chemotherapy and cranial irradiation. In intratubular germ cell neoplasia (TIN), radiotherapy with 20 Gy will safely eliminate all TIN loci, but will destroy potential residual fertility.