Tuberculosis is an infectious disease caused by bacteria belonging to mycobacterium family (KOCH bacillus). It often affects low socioeconomic populations, immunosuppressed individuals, and elderly people. The lung remains the most frequent localization in endemic countries followed by visceral involvement especially digestive one. Our patient is 46 years old with no particular history who presented a mammary nodule measuring 4.5 cm located at the level of the supero-internal quadrant with no inflammatory sign, with stable general conditions. The mammogram shows a poorly circumscribed and dense lesion without calcifications with disorganization of the mammary architecture and surface thickening of the skin. A decision of an extemporaneous examination was made by the surgical team with an initial diagnosis of breast carcinoma. A diagnosis of granulomatous mastitis has been made by our team while waiting confirmation of the specificity of the inflammatory reaction after paraffin inclusion. Histological examination after formalin fixation and paraffin inclusion confirms the tuberculous origin of the lesion. Breast tuberculosis is a rare disease, even in endemic countries. Its incidence is low both as tuberculous localization (0.06 to 0.1%) and breast disease (0.025 to 4.5%). The disease evolves in an insidious way and is rarely accompanied by general signs.