One of the established risk factors of testicular tumor is undescending testis affected by environmental and genetic factors. We report a case of testicular tumor associated with a history of contralateral undescended testis in a patient of Taleghani hospital in the year 2003. A 38-year-old man visited the hospital complaining of painless swelling of the left scrotal contents. Right orchiectomy had been performed folowing the diagnosis of undescending testis, eight years earlier. He had a firm mass with 10cm6 cm in the left scrotum and lab tests revealed high alpha-fetoprotein. Left radical inguinal orchiectomy was performed and the pathological diagnosis of the tumor was germ cell tumor, Teratocarcinoma. Previous pathologic report of undescending testis was atrophic testis. In conclusion, considering the higher risk of development of testicular cancer in both gonads in patients with undescending testis, long term follow up is recommended.
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