The cytologic evaluation of physical findings can provide critical early, and sometimes definitive, insight into the etiology of a clinical breast or axillary lesion. The most common samples submitted for cytologic examination include nipple discharge samples, breast cyst fluid, and fine needle aspiration (FNA) biopsies of solid masses. Ductal lavage sampling is a screening technique that is primarily used in the research setting. Understanding the breadth, depth, and limitations of breast cytology is a necessary skill in managing patients with benign and malignant breast findings.
Fine Needle Aspiration Needle Core Biopsy Fine Needle Aspiration Biopsy Atypical Duct Hyperplasia Nipple Discharge
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The authors thank Anet James for her expert assistance with the images and figures.
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