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BREAST CYTOPATHOLOGY

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116 4. Primary Malignant Tumors

Pitfalls and Differential Diagnosis

• Invasive ductal carcinoma NOS

Secretory Carcinoma

Clinical Features

• First reported in children and called juvenile carcinoma

• Occurs in children, adolescents, and adults

• Occurs in both men and women

• Shows a tubuloalveolar pattern of growth

Cytomorphologic Characteristics

• Hypercellular smears

• Background mucinous material

• Cells with abundant cytoplasm and intracytoplasmic vacuoles

• “Globules” of secretory material

Pitfalls and Differential Diagnosis

• Fibrocystic changes, papillomatosis

• Lactational changes

Adenoid Cystic Carcinoma

Clinical Features

• Rare tumors with good prognosis

• Slowly enlarging breast mass

• Lobulated and well-defined by mammography

Cytomorphologic Characteristics (Figures 4.38 and 4.39)

• Smears with globules and/or cylinders of pale blue hyaline

material on Papanicolaou stain

• Bright magenta globules on Diff-Quik stain

• Small hyperchromatic cells with very little cytoplasm

surrounding the globules

• Inconspicuous nucleoli

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