Paratesticular metastasis from Wilms tumor: the possible routs of metastasis and literature review.

Testicular or paratesticular metastasis from Wilms tumor (WT) is extremely rare. We report a 5-year-old boy with WT of right kidney presented with metastasis to the ipsilateral spermatic cord. The patient underwent a high inguinal right orchiectomy. Histopathological examination revealed infiltration of WT to spermatic cord but the testis and epididymis were not involved. The patient received the standard chemotherapy regimen but the response to treatment was poor with 2 tumor recurrences within the follow-up period. Among the mechanisms of metastasis to scrotal region, retrograde venous and the patent processus vaginalis seem to be more common and also preventable.