Fig. 3

Histopathology of a malignant fibrous histiocytoma resected from the spleen. a Note the plump, spindle-shaped fibroblasts and histiocyte-like cells and the storiform pattern. Oval or polygonal malignant spindle cells with anisokaryosis and coarse nuclei, as well as scattered inflammatory cells, are shown (hematoxylin and eosin, magnification × 400, scale bar = 35 μm). b Immunohistochemically, the tumor cells were strongly positive for vimentin (magnification × 400, scale bar = 35 μm)