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A case of primary mediastinal germ cell tumor, which demonstrated spontaneous regression, is presented. The serum human chorionic gonadotropin level was elevated on admission and then decreased to the normal range with decrease in the size of the anterior mediastinal mass. Thoracotomy was performed with artificial replacement by grafts between the bilateral brachiocephalic veins and the right atrium. Histological diagnosis of combined teratoma with seminoma was made. After subsequent chemotherapy, the patient has remained alive without recurrence for over 10 years.

Spontaneous Regression of Primary Mediastinal Germ Cell Tumor