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Occult seminoma of the testis masquerading as primary extragonadal germinal neoplasms

Case histories of two patients who had atrophic testes and clinically unsuspected primary testicular neoplasms that masqueraded as primary seminoma of the mediastinum and primary retroperitoneal embryonal carcinoma are presented. Similar cases from the literature are reviewed. The question of whether all so‐called primary extragonadal germinal tumors actually represent metastasis from either microscopic testicular primaries or testicular primary foci that have undergone involution is discussed.