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(A) Hemosiderin pigment with irregular distribution is observed among the spindle cells forming interlacing bundles (H&E, ×400). (B) Spindle cells showed a staining with MT in favor of muscle (MT, ×400). (C) Acellular material accumulation with homogeneous eosinophilic appearance, called as "amianthoid fibers," is observed in the lesion (H&E, ×400). (D) Amianthoid fibers demonstrated staining typical of collagen (MT, ×400).
