medullary carcinoma of breast

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medullary carcinoma of breast2016-11-08T22:30:24+00:00

medullary carcinoma of breast 

medullary carcinoma of breast image from New Medical Terms

low power H&E stained section of medullary carcinoma of breast


An uncommon type–5% of all breast carcinomas–of infiltrating ductal carcinoma affecting women under age 50, which is more common in the Japanese and in those with the BRCA1 mutation

Prognosis 84% 10-year survival vs ductal carcinoma, 63%. 

Macro Well-circumscribed, soft, rounded and cystic tumour mass with pushing rather than infiltrating margin; it is often large before it metastasizes to axillary lymph nodes; lesions may be haemorrhagic and necrotic

Micro Clusters and sheets of cells with indistinct cell borders, lacking glandular or ductal differentiation, arranged in a syncytial pattern; cells have abundant eosinophilic cytoplasm, large bizarre and pleomorphic or anaplastic nuclei, prominent nucleoli, and frequent mitoses, and a prominent lymphoplasmacytic inflammation peripheral to “pushing” tumour margins, which consists of peripheral T-cells including activated cytotoxic lymphocytes and IgA plasma cells that are a host response to the tumour.

References Modern Pathology (2010) 23, 1357–1363; doi:10.1038/modpathol.2010.123

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