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A case of bilateral testicular tumours of germ cell origin is reported. A 35-year-old man with bilateral testicular swelling visited our clinic. Bilateral high orchiectomy was performed. Histological examination of both resected testis revealed typical seminoma. Postoperative irradiation was performed. The patient is doing well after one year of postoperative follow-up without any sign of metastasis. Besides this case, we found 115 cases of bilateral testicular germ cell tumours in the Japanese literature. There were 39 cases with different and 76 cases with similar histology between the left and right testis. The age distribution, location of testis, time of onset and histological classification of these cases is discussed.
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