Fig. 4
From: Primary spindle cell tumor originating from the liver that was difficult to diagnose
Microscopic findings of the tumor. Hematoxylin and eosin staining. a Section shows a proliferation of anaplastic cells with clear cytoplasm and round heteroplasm. Map-like necrotic foci are seen in some areas. b Some areas contain fat droplets and exhibit lipomatous features. Mitotic figures are rarely seen. c Bundled proliferation of spindle-shaped cells is seen in some tumors. d Myxoid or microcystic changes of the stroma and hemangiopericytomatous vessels are also seen