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BREAST CYTOPATHOLOGY

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64 3. Benign and Borderline Tumors

Figure 3.9. Benign phyllodes tumor. Hypercellular smear composed

of large, irregular fragments of ductal epithelium, loose

myxoid/mucinous stroma, and abundant myoepithelium. A cytomorphologic

distinction from fibroadenoma would be extremely

difficult. (Smear, Papanicolaou.)

Figure 3.10. Benign phyllodes tumor. Hypercellular smear consists

predominantly of irregular branching ductal epithelium. A small

amount of myxoid stroma is noted at 11:00 o’clock. (Smear,

Diff-Quik.)

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