PMC5306968_01
Histopathological findings. Plexiform proliferation of tumor cells with micronodules set in a myxoid background (hematoxylin and eosin stain; x40 magnification).
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fig1
The tumor exhibited plexiform and nodular growth of both myofibroblast-like spindle cells and epithelioid cells, set in a prominent myxoid stroma (Figures 1(a) and 1(b)).
Histopathological findings. Cellular areas composed of histiocyte-like cells and spindled fibroblast-like cells at the periphery (hematoxylin and eosin stain; x200 magnification).
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fig2
The cellular areas were composed of epithelioid and histiocyte-like cells with few multinucleated giant cells (Figure 2).
Immunohistochemical study. Immunohistochemical staining for (a) CD68, diffusely positive in epithelioid or histiocyte-like cells, and (b) CD34, diffusely positive in spindle or fibroblast-like cells (x200 magnification).
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fig3
Immunohistochemically, the epithelioid cells were positive for CD68, while the spindle cells were diffusely positive for CD34 and focally positive for smooth muscle actin (SMA) (Figures 3(a) and 3(b)).