Ectopic Breast Tissue (EBT) refers to supernumerary and aberrant breast tissue . A classification of EBT has been offered by Copeland and Geschickter, in which accessory nipple formation, areolar formation, or both, with or without glandular breast, is termed supernumerary breast, as opposed to aberrant breast, referring to ectopic breast tissue without a nipple or areolar complex . EBT without the presence of a nipple located beyond the periphery of the gland is defined as aberrant breast tissue and is frequently misdiagnosed as a subcutaneous lesion. EBT results from a failure of regression of the mammary ridges during embryogenesis ]. It can be present anywhere along the milk line, from the axilla to the inguinal region. The incidence of ectopic accessory breast is uncertain, but it is generally accepted to be found in 1-2% of humans. EBT is subject to all of the physiological and pathological changes of the normal breast, including carcinoma , although carcinoma of aberrant breast tissue is rare .