Significant advances in the management of disseminated carcinoma of the testis have had a tremendous influence on the management of all stages of disease, including both stage I and stage II. Because the disease is so uniformly curable in advanced forms, strategies have evolved for lower stages of disease to maximize curative potential with minimization of therapeutic intervention and potential long-term side effects. This review addresses issues of diagnosis and initial clinical staging of patients with stage I carcinoma of the testis. The usefulness of biological tumor markers and the accuracy, sensitivity, and specificity of radiographic imaging modalities are emphasized. The traditional treatment of stage I seminomas and nonseminomas includes the role of both radiation therapy and retroperitoneal lymph node dissection (RPLND). Treatment results and complications of each modality are also reviewed. The importance of orchiectomy followed by meticulous surveillance, as well as a critical analysis of prognostic features of subsequent locoregional or systemic relapse in patients with stage I testis cancer, focuses attention on changing concepts of this disease. The rationale underlying improved ability to stage patients meticulously and offer therapeutic intervention when necessary following orchiectomy, constitutes the focus of present and future clinical research. Such strategies are discussed in detail.