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(a) Spindle cells within smooth muscle fascicles. (H and E, ×200) (b) Scattered clusters of bland spindled cells in a background of histiocytes and mesothelial cells. (ThinPrep, ×200) (c) Spindle cells cluster lined by lymphatic-like endothelial cells. (ThinPrep, ×400) (d) H and E, ×400
