Aberrant Breast Tissue Associated with Acanthosis Nigricans / 대한피부과학회지

Aberrant breast tissue is a subset of accessory breast tissue, and it exhibits similar consistency to that of the adjacent normal breast tissue, but it lacks an associated nipple complex. It is a developmental anomaly defined as the persistence of breast tissue along the embryonic mammary line. Aberrant breast tissue is most commonly located in the axilla, though it may be present anywhere along the embryonic mammary line. We report here on an 11-year-old girl with aberrant breast tissue and acanthosis nigricans. She had tender masses that became noticeable with the onset of menarche and mottled hyperpigmentation on both axillae. The histopathologic finding of the lesion revealed the typical features of aberrant breast tissue with acanthosis nigricans.

Invasive Ductal Carcinoma Arising from Axillary Accessory Breast / 한국유방암학회지

As a consequence of the incomplete resolution of embryologic mammary ridges, ectopic breast tissue can be present anywhere along the "milk line", including the axillary region. Aberrant breast tissue can develop with any disease that affects the normal breast, including a breast carcinoma. A carcinoma of aberrant breast tissue is rare, but should still be investigated and treated properly with respect to other breast cancers in the embryonic milk-line. Herein is reported our recent experience of a carcinoma originating from aberrant breast tissue in the right axilla. An abnormal nodule around the periphery of the normal breast should be suspected as a breast carcinoma and differential diagnosis and properly treated.