Tumors may develop in both testes, either concomitantly or sequentially. Three cases of bilateral testicular neoplasms are reported. One patient had concomitant seminomas and another had sequential germ cell tumors separated by an 11 yr interval. The 3rd patient is an unusual case in that he had bilateral testicular germ cell tumors diagnosed concomitantly 8 yr after irradiation of an extragonadal, histologically proved seminoma in the mediastinum. Evidence suggests that all 3 sites, each testis and the mediastinum, were primary lesions. Standard methods of therapy should be used in the treatment of these malignant conditions.
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