Intraductal carcinoma of the prostate metastatic to the penile urethra: A rare demonstration of two morphologic patterns of tumor growth

Summary Penile metastases from prostate cancer are rare and are usually a manifestation of wide‐spread cancer dissemination. Isolated urethral metastases form a small fraction of these cases, have a longer survival rate and may represent spread by implantation following instrumentation. We report a case of prostatic carcinoma presenting with an isolated metastasis to the penile urethra after catheterisation and transurethral prostatectomy. The primary tumor had a prominent intraductal component whose architectural features were mimicked in the metastasis. The possible mechanisms of spread and the diverse appearances of cancer associated with an intraductal component are discussed.Abbreviations: DRE, digital rectal examination; IDC‐P, intraduct carcinoma of prostate; PIN, prostatic intra‐epithelial neoplasia; PSA, prostate specific antigen; TURP, transurethral resection of prostate.

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