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Figure 1: (a) The presence of fascicles and/or storiform arrangement which is (b) often intercepted by the presence of microcysts or (c) a prominent hemangiopericytomatous pattern (H and E, ×100). (d) The individual cells have oval nuclei with scant cytoplasm; lymphocytes are not discernible (H and E, ×200). These features characterize Type A thymomas

Figure 1: (a) The presence of fascicles and/or storiform arrangement which is (b) often intercepted by the presence of microcysts or (c) a prominent hemangiopericytomatous pattern (H and E, ×100). (d) The individual cells have oval nuclei with scant cytoplasm; lymphocytes are not discernible (H and E, ×200). These features characterize Type A thymomas