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BREAST CYTOPATHOLOGY

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108 4. Primary Malignant Tumors

• Characteristically, abundant mucin that can be seen

grossly

Cytomorphologic Characteristics (Figures 4.26 to 4.29)

• Abundant mucin

• Gelatinous-appearing aspirates

• Loosely cohesive, minimally pleomorphic epithelial

fragments

• Occasional single malignant cells

• Cytoplasmic mucin vacuoles

• Fragments of stroma with capillary vessels

Pitfalls and Differential Diagnosis

• Mucocele

• Adenoid cystic carcinoma

• Fibroadenoma showing myxoid change

Figure 4.26. Colloid carcinoma. Abundant mucin containing a few

loosely cohesive fragments of carcinoma cells. The appearance of

malignant cells in colloid carcinoma is often low grade, requiring

careful exclusion of other benign entities with mucinous features

such as mucocele and fibroadenoma with abundant mucinous

stroma. (Smear, Papanicolaou.)

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