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Necrobiotic palisading granulomas associated with breast carcinoma

Aims: The presence of granulomas within the stroma of carcinomas and in the lymph nodes draining carcinomas has been well described. To date, however, there have been few studies examining the occurrence and relevance of necrobiotic granulomas occurring in association with breast carcinoma. Methods/Results: Four cases of breast carcinoma with necrobiotic granulomas were examined using periodic acid Schiff and Ziehl Neelsen stains for fungi and tubercle bacilli and with immunohistochemistry using CAM5.2, cytokeratin 7, and cytokeratin AE1/3 for tumour cells. In one case the stroma was involved, in the other three cases the lymph nodes contained necrobiotic granulomas. In two of the cases, one with stromal and one with lymph node involvement, the necrobiotic granulomas contained necrotic tumour cells. Conclusion: In this study the features of four cases of breast carcinomas with necrobiotic granulomas are examined and their relevance explored. Close scrutiny of such granulomas is necessary to avoid underdiagnosis of metastatic disease.