Introduction: Breast fibroadenoma in the axilla is a rare manifestation that consists of biphasic proliferation of fibromyxoid stroma without atypia or mitosis, with a glandular component consisting of two luminal and myoepithelial layers. In this study, breast fibroadenoma in the left axilla of a 45-year-old woman is presented.
Case presentation: The patient was a 45-year-old woman complaining palpation of a mass in the left axilla that underwent a needle biopsy, but in the ultrasound and mammography examination, both breasts were normal and without mass. In the pathology examination of the needle biopsy specimen of the axillary mass, biphasic proliferation of fibromyxoid stroma without atypia or mitosis, along with a glandular component consisting of two layers of luminal and myoepithelial tuberculosis was observed, and after the pathological examination of the surgical specimen, the diagnosis of fibroadenoma was confirmed. During the one year follow-up, the patient was alive with good general condition.
Conclusion: A careful examination of any swelling in the axilla area of a woman should be considered, because even though the main breast tissue is normal, it may be caused by benign or even malignant neoplasms from the accessory breast.