Ultrasonographic Pattern of Testicular Metastasis of Clear Cell Renal Cell Carcinoma with Pathological Correlation.

Two cases of testicular metastases of a clear cell renal cell carcinoma sharing a very similar ultrasonographic pattern are reported. The observed pattern - masses containing multiple tiny cyst-like areas - is very similar to that of a previously described ovarian metastasis of clear cell renal parenchymal tumor and can be explained by histopathologic features. Despite the small number of cases, this ultrasonographic pattern of testicular mass may be specific for metastasis of clear cell renal cell carcinoma origin.