Aggressive Mucinous Carcinoma of Male Breast

We report of a mucinous carcinoma of the breast in a 62-year-old male, who presented with left breast mass and incisional biopsy scar. Incisional biopsy showed invasive mucinous carcinoma with endocrine differentiation. Patient underwent a simple mastectomy and sentinel lymph node biopsy (SLNB). In definitive pathologic examination, tumor showed estrogen- and progesterone-positive and her2-neu-negative receptor status. This was followed by adjuvant chemotherapy. After 2 weeks of the first cure chemotherapy treatment, patient admitted with respiratory distress and diagnosed as having thoracentesis requiring massive pleural effusion. In the detailed examination, multiple hepatic metastases were detected. In this report, we present a male patient with mucinous breast carcinoma and multiple distant metastases.