The male breast cancer accounts for nearly 1% of all breast cancer cases and bilateral involvement occurs inless than 2% of the cases. Estrogen treatment for prostate cancer is a risk factor for primary breast cancer.Bilateral breast carcinomas were found in a 79-year-old Brazilian black man, following prostate cancer treatmentwith estrogen. Prostate cancer metastases could be found in breast tissue, and might be indistinguishable fromprimary breast tumours on histological evaluation without immunohistochemistry. Coexistence of prostate cancerwith breast cancer increases future-longevity concerns.
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