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BREAST CYTOPATHOLOGY

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Special Types of Breast Carcinomas 113

Figure 4.33. Tubular carcinoma. The tumor consists of small, round,

uniform nuclei arranged in tubules with open lumens and prominent

scalloping (noted at 6 o’clock). (Smear, Papanicolaou.)

• More common in younger patients

• Presents as a solitary, soft, well-circumscribed, and mobile

mass

• Clinically mimics fibroadenoma, benign cyst, or an intramammary

lymph node

• Much better prognosis, even with axillary node metastasis

Cytomorphologic Characteristics (Figures 4.34 to 4.37)

• Hypercellular smears

• Relatively larger, pleomorphic cells, single or in loose clusters,

often syncytial arrangements

• Large nuclei with large nucleoli

• Naked nuclei with macronucleoli, better appreciated on

Diff-Quik stain

• Background lymphocytes, often in close proximity to cellular

syncytia

• Cellular degeneration and/or necrosis

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