Testicular Metastasis from Urothelial Carcinoma of the Renal Pelvis: A Rare Case and Review of the Literature.

This paper presents an extremely rare case of testicular metastasis arising from renal pelvis carcinoma. The testicle is a rare site of clinically detectable tumor metastasis, originating rarely from upper tract urothelial carcinoma (UTUC). There are only two cases concerning UTUC metastasis to the testis available in the literature. In this report, we presented a patient who developed serial testicle, lung, liver and retroperitoneal lymph node metastasis from primary urothelial carcinoma of the renal pelvis within one year after surgery and chemotherapy. In conclusion, for patients with a history of UTUC who present with testicular symptoms, clinicians should be highly alert for the possibility of malignant involvement at this site.