Malignant Mesothelioma Mimicking Invasive Mammary Carcinoma in a Male Breast

Figure 2

Histopathology and immunoprofile of the metastatic malignant mesothelioma to the breast. ((a) and (b)) Representative H&E captions from the metastatic malignant mesothelioma in the breast biopsy which show proliferation of neoplastic epithelioid cells forming cords and nests which infiltrate the breast parenchyma and skeletal muscles. The neoplastic cells are round to polygonal with moderate cytoplasm, moderate cytologic pleomorphism, and occasional nucleoli. The neoplastic cells are positive for WT1 (inset in (b)), calretinin (c), and CK5/6 (d).

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