Breast Imaging of Axillary Supernumerary Breast: About a Clinical Case

Axillary breast is a subject that is poorly studied in the medical literature. We report the case of a 41-year-old woman who consulted for a painful right axillary mass, increasing in volume during menstrual cycles. The clinical examination revealed a 3 cm diameter axillary swelling, mobile, soft, without inflammatory signs or discharge. The mammography showed a dense and homogeneous area in the right axillary region, corresponding to an ectopic mammary glandular parenchyma. The ultrasound confirmed the presence of an axillary fibroglandular component, without focal anomaly or adenopathy. The diagnosis of accessory axillary breast was retained. This case illustrates the interest of imaging for the diagnosis and assessment of the accessory axillary breast, a rare anomaly but potentially at risk of neoplastic degeneration.