Histopathology showed a well-defined lesion consisting of nonatypical stellate and fusiform fibroblasts and myofibroblasts on a background of thick, dense collagen, with myxoid areas and sparse capillaries that were neither… Click to show full abstract
Histopathology showed a well-defined lesion consisting of nonatypical stellate and fusiform fibroblasts and myofibroblasts on a background of thick, dense collagen, with myxoid areas and sparse capillaries that were neither atypical nor prominent (Fig. 2). These cells were positive for vimentin, focally positive for smooth muscle actin, and negative for CD34, desmin, S100, -catenin, AE1/AE3, and epithelial membrane antigen (EMA). Ki67 immunostaining revealed a cell proliferation index of 1%.
               
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