Another example of metastatic prostatic adenocarcinoma in the testis. The tumor cells appear to recapitulate pattern of Gleason grade 4. In testicular metastases, the most common sites of origin are prostate, lung, skin, colon, and kidney. Features that favor metastases over primary testicular tumor include: advanced age, history of cancer, interstitial growth pattern, vascular invasion, multifocality, and bilaterality.
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