Fig. 2

Solid cellular area of the tumor. A, B The spindle tumor cells are arranged in fascicular and whorled pattern resembling solitary fibrous tumor(H&E stain, × 200); (C) In some epithelioid areas, atypical or even bizarre nuclei can be seen (H&E stain, × 200); (D,E) The atypical cells are positive for TTF-1 and EMA (× 100). (F) The Ki-67 index of the spindle tumor cells is low (× 400)