[Retroperitoneal seminoma without testicular lesion. A case report and review of the literature].

The case of a 54-year-old man with a retroperitoneal seminoma and normal testes is reported. Diagnosis was established late, when the tumor had become large and inoperable and produced symptoms of subocclusion. Onset of gynecomastia, an uncommon occurrence, had been recorded two years earlier and should have given rise to suspicion. The tumor was a histologically unmixed seminoma with very significant beta-HCG secretion. A chemotherapy-radiotherapy combination produced dramatic improvement. From data from a review of the literature, pathogenesis, diagnosis and management of this uncommon type of seminoma are discussed.