A case of fibroadenomas simultaneously arising in a mammary gland and the ipsilateral axillary accessory mammary gland

Abstract

We report a case with two concurrent fibroadenomas arising from the right axillary accessory mammary gland and the mammary gland. A 42-year-old woman noticed an elastic hard mass in the right axillary region. A right breast cancer with regional lymph node metastasis was suspected, but aspiration biopsy cytology was not diagnostic. On excisional biopsy both the axillary accessory mammary gland lesio and the mammary lesion were diagnosed as fibroadenoma. This case cautions against doing an excessive resection for an axillary accessory gland tumor since it can be difficult to distinguish from breast cancer lymph node metastasis.