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Histopathologic heterogeneity of breast cancer: invasive mammary carcinoma with mixed morphology (A), composed of basaloid areas with osteoid production (B) and ductal not otherwise specified (C) components. Lymph node metastasis showing a diffuse pattern of tumor growth (D). Magnification: 100× (A), 200× (B–D); Hematoxylin-eosin staining.
