PMC3678685_01
Histopathology of the tumor showing spindle cells arranged in whorls with eosinophilic cytoplasm (H and E, x200)
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F1
Histopathology revealed a tumor composed of spindle cells, arranged in fascicles and whorls, having pale eosinophilic cytoplasm, hyperchromatic pleomorphic oval and spindle nuclei, with 8-10 mitoses/10 high power fields [Figure 1].
Intense desmin staining of the tumor cells (IPOX, 200)
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F2
Histopathology review and immunohistochemistry revealed diagnosis of IRMFS with strong positivity for desmin, smooth muscle actin and vimentin, and negativity for myogenin-D1, myoglobin and cluster of differentiation (CD) 34 [Figure 2].