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Primary epidermoid carcinoma (PEC) also known as squamous cell carcinoma of the breast is a rare tumor accounting for 0.1% to 2% of all breast cancers. It is a metaplastic carcinoma; its histogenesis and prognosis are controversial as well as its clinical and mammographic appearances which are not characteristic compared to other cancers. PEC is characterized by a rapid evolution and treatment is not codified. The purpose of this study is to report the clinical and evolutionary features of a new case of PEC and to conduct a literature review., Competing Interests: Les auteurs ne déclarent aucun conflit d’intérêts.