Introduction: The male breast encompasses a number of conditions that can be both benign and malignant, the most common cause of increased male breast, gynecomastia. Male breast cancer is a very rare entity that accounts for less than 1% of all breast cancers. Case Report: We present the case of a 44-year-old patient, who is presented to the emergency department by a picture of approximately one year of evolution, consisting of tumefaction located in left breast with erythema and pain, becoming the diagnosis of mass tumor. Discussion: Male breast cancer is an uncommon entity, accounting for about 1% of all male cancers. The most commonly observed histological subtypes of male breast cancer are non-special invasive carcinoma (84-90%) papillary carcinoma (2-5%). The other histological subtypes are very rare.