We report a case of metachronous bilateral
testicular tumors. A 36-year-old man was admitted to our hospital with the chief complaint of painless left scrotal swelling. He had undergone right high
orchiectomy for testicular
seminoma, stage I, one year earlier. This time, ultrasonography demonstrated two hypoechoic mass and microlithiasis of the left testis. Abdominal and chest computed tomography revealed no lymph
adenopathy and no
metastasis. The preoperative diagnosis was stage I
testicular tumor and subsequently left high
orchiectomy was performed. Histopathological examination revealed typical
seminoma. To our knowledge, including the present case, 191 cases of metachronous bilateral
testicular tumors have been reported in Japan. Contralateral
testicular tumor was observed at a mean age of 37.3 years and the mean interval of time between the initial
testicular tumor and contralateral one was 73.0 months Approximately fifty percent of metachronous bilateral
testicular tumors previously reported have recurred after five years or more from the initial surgery. In the
testicular tumor, long-term follow-up and self examination of the contralateral testis are of great importance.