Objective: To present a case of endobronchial metastasis from a seminoma mimicking a primary pulmonary mass on X-ray radiograph. Clinical Presentation and Intervention: A 27-year-old man presented with a 1-month history of hemoptysis. Thorax computerized tomography of the patient obtained at the level of the main right bronchi demonstrated a mass with a size of 7 x 6 cm and a peripheral lobulated nodule. Bronchoscopic examination showed narrowing and multiple nodules in the right upper and right intermediary lobar bronchi. Histopathological examination of bronchial biopsies and brushing confirmed endobronchial metastasis of the testicular seminoma. Conclusion: This case shows the prognostic significance of distinguishing endobronchial metastasis from primary lung carcinoma. Copyright (C) 2008 S. Karger AG, Basel.