Fine Needle Aspiration Cytology · Pathology

A breast FNA shows cohesive clusters of ductal cells with a 'bimodal' population of epithelial and myoepithelial cells, along with 'naked' bipolar nuclei in the background. What is the most likely diagnosis?

  1. Ductal Carcinoma In Situ
  2. Invasive Ductal Carcinoma
  3. Fibroadenoma
  4. Phyllodes tumor
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Correct answer: Fibroadenoma

The presence of a bimodal cell population and numerous stripped (naked) bipolar nuclei in the background is characteristic of a benign fibroadenoma. Malignant breast lesions typically show a loss of myoepithelial cells.

Difficulty: Medium Question 9 of 20

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