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Germ cell tumors are unusual, but they represent the most common neoplasm in young men. Since the introduction of cisplatin-based chemotherapy, most cases are expected to be cured today. Intensive monitoring of these patients during follow-up is required to rule out relapses or late complications of therapy. We present the case of a 21-year-old male who developed extensive lung dissemination by Langerhans cell histiocytosis eight months after the successful treatment of a bulky mediastinal seminoma.