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Figure 4: (a-d) Type B3 thymomas are characterized by sheets of polygonal epithelial cells with mild to moderate anisonucleosis with sparse or no discernible lymphocytes. Prominent epithelial formations, e.g., perivascular palisading may be seen (H and E, ×200)

Figure 4: (a-d) Type B3 thymomas are characterized by sheets of polygonal epithelial cells with mild to moderate anisonucleosis with sparse or no discernible lymphocytes. Prominent epithelial formations, e.g., perivascular palisading may be seen (H and E, ×200)