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Figure 2: (a) Type AB thymoma has discreet Type A areas with spindle-shaped cells and Type B areas, which in this study were mostly lymphocyte rich Type B1 or B2 areas (H and E, ×400). (b) Type B1 thymomas show the presence of abundant lymphocytes and epithelial cells that are found with difficulty, sometimes requiring immunohistochemistry. Most of the epithelial cells are singly scattered; no large groups or clusters are found (H and E, ×40). Inset shows occasional Hassall's corpuscles. (c) High-power field of polygonal epithelial cells with vesicular nucleus and prominent nucleoli

Figure 2: (a) Type AB thymoma has discreet Type A areas with spindle-shaped cells and Type B areas, which in this study were mostly lymphocyte rich Type B1 or B2 areas (H and E, ×400). (b) Type B1 thymomas show the presence of abundant lymphocytes and epithelial cells that are found with difficulty, sometimes requiring immunohistochemistry. Most of the epithelial cells are singly scattered; no large groups or clusters are found (H and E, ×40). Inset shows occasional Hassall's corpuscles. (c) High-power field of polygonal epithelial cells with vesicular nucleus and prominent nucleoli