Serviço de Mastologia, Hospital Materno Infantil, Goiânia-GO to report a case of male breast cancer. Case report: male, 66 years, complaining about right breast mass, perceived about 30 days ago. He reports having high blood pressure and making use of propranolol. Denied use of anabolics. Family history: a paternal aunt and a cousin with breast cancer; paternal aunt with stomach cancer; paternal grandmother with liver cancer. Physical examination: hardened tumor, regular in a retrorareolar region of the right breast, slightly mobile, measuring approximately 1.5 cm. Ultrasonography of the right breast showed hypoechoic mass with anechoic areas, lobulated contours, partially defined, measuring 1.9×1.5×1.1 cm. The mammogram did not show suspicious findings. Core-biopsy was performed with histopathological examination demonstrating infiltrating mammary carcinoma. Patient underwent mastectomy with sentinel lymph node biopsy. Histopathological study, associated with immunohistochemical findings, demonstrated solid papillary carcinoma of 2.0×2.0x1.5 cm, histological grade 2, with estrogen receptor positive, progesterone receptor positive, androgen receptor positive and HER2 negative; neoplasm-free surgical margins; sentinel lymph node: absence of neoplasia. Genetic mutation research was negative. Currently, the patient has 6 months of follow-up, using tamoxifen and no evidence of relapse. male breast cancer is uncommon. The breast surgeon must have the ability to recognize suspicious lesions in the male breast, making diagnosis and treatment possible as soon as possible.Breast-Cancer, male
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