[A case of bilateral germ cell tumor of the testis].

A 28-year-old man visited our hospital with a complaint of left testicular pain and swelling. Left orchiectomy was performed, and its pathological finding was embryonal carcinoma (seminoma in a small portion). Though no sign of metastasis was detected and the serum tumor markers, alpha-fetoprotein, and beta-human chorionic gonadotropin (HCG) decreased in value as expected, he has undergone two courses of chemotherapy (PVB regimen). Twenty months after operation the patient found contralateral testicular induration, and serum beta-HCG was abnormally high, 36.0 ng/ml. We performed right orchiectomy. The pathology revealed pure seminoma. He has been followed up without adjuvant therapy.