The frequency of breast tissue outside the mammary gland, or supernumerary breast, is rare, with a reported incidence in women of 0.3 to 6% [1].This tissue is typically located in the armpit [1,2], ectopic tissue can be the site of benign or malignant physiological variations similar to normally located breast tissue.The axilla is the most common site, while the sternal, infra-clavicular, epigastric, and vulvar regions have also been described.We report a case of infiltrating lobular carcinoma of the axillary supernumerary breast managed at the Tidjini HADDAM Cancer Center in Sidi bel abbes in ALGERIA.
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