We report two cases of metachronous bilateral testicular tumors. In the first case (48 years old), and the second case (39 years old) the contralateral tumor developed 106 months and 63 months after the initial therapy, respectively. In both cases, the primary and the contralateral tumors were stage I seminomas. The patients underwent high inguinal orchiectomy and adjuvant retroperitoneal irradiation for the primary tumor, and only high inguinal orchiectomy for the contralateral tumor. There was no recurrence following the second operation in either case. In the second case, preoperative cryopreservation of the semen was performed for future artificial insemination. Long-term follow-up of contralateral testis is necessary for patients with testicular cancer, even if good prognosis is expected. The quality of life of the patients with bilateral testicular tumors should be maintained by preserving fertility and replacing androgen.
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