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Various types of cellularity of pulmonary artery intimal sarcoma: (a) small, round tumor cells in cellular area of pulmonary artery intimal sarcoma (H and E, ×20); (b) the same cells in myxoid background of tumor with (H and E, ×20); (c) zone of pulmonary artery intimal sarcoma with mixed, hypo- and hypercellularity (H and E, ×20)
