Carcinoma in ectopic breast: a cytological diagnosis

Ectopic breast carcinoma in the axillary region is rare with an incidence ranging from 0.3-6%. We report a case of infiltrating duct carcinoma in an adult female arising in aberrant breast tissue in the axilla diagnosed on fine needle aspiration cytology. There was history of recent increase in size of the lump which was otherwise present for the past 5 years. This case highlights the role fine needle aspiration cytology can play in the early diagnosis of malignant transformation of lumps.