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Fine‐needle aspiration cytology of breast carcinoma with endocrine differentiation

The value of fine‐needle aspiration (FNA) in atypical proliferative to in situ to low grade invasive breast lesions remains limited due to the overlapping cytologic features of these entities. In the current study the authors review the FNA cytology of endocrine carcinoma and identify common cytologic features that allow for the diagnosis of this uncommon, low grade subtype of mammary malignancy.