Fibroadenoma with multinucleate giant cells and mucinous degeneration
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The correct answer is:
Low grade duct cell carcinoma with osteoclast-like giant cells and mucinous features
- The fine needle aspiration of left breast is a cellular specimen that shows single and cohesive atypical duct epithelial cells and many multinucleate osteoclast-like giant cells in a background of mucin. Bipolar naked nuclei were not prominent. Definite myoepithelial cells could not be identified in the cohesive groups.
- These findings are suspicious for low-grade duct cell carcinoma with mucinous features.
- Examination of a core biopsy of the breast revealed an invasive grade 1/3 ductal carcinoma with numerous osteoclast-like giant cells and cellular stroma. Increased mucin was not noted although the sampled material is limited and may not be entirely representative of the whole tumour.
- Multinucleated osteoclast-like giant cells as a component of breast carcinoma are uncommon.
- About two-thirds of patients with carcinoma with osteoclast-like giant cells are less than 50 years old.
- The histogenesis of the giant cells is controversial. Studies utilising immunohistochemistry and electron microscopy have demonstrated both epithelial origin and histiocytic origin. Most authors favour the latter.
- Osteoclast-like giant cells may be associated with metaplastic carcinoma and malignant fibrous histiocytoma.
- Benign mutlinucleated giant cells that may be atypical may be seen in the stroma of fibroadenoma but other features of fibroadenoma including cohesive branching fragments of benign duct and myoepithelial cells, hypocellular fibrous stroma and background bipolar naked nuclei should be present.
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