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Figure 2: Biopsy from anterior mediastinal mass consistent with thymoma. (a) Lobules of thymoma, Type B2 (H and E, ×40). (b) Numerous mature T lymphocytes and epithelial-like cells with large vesicular nuclei (H and E, ×600). (c) Epithelial cells stain positive for cytokeratin 7 (IHC, ×600)

Figure 2: Biopsy from anterior mediastinal mass consistent with thymoma. (a) Lobules of thymoma, Type B2 (H and E, ×40). (b) Numerous mature T lymphocytes and epithelial-like cells with large vesicular nuclei (H and E, ×600). (c) Epithelial cells stain positive for cytokeratin 7 (IHC, ×600)