Figure 2

Histological features. Section stained with hematoxylin and eosin reveals evenly spaced plump spindle cells arranged in intersecting fascicles and associated with mild to moderate amounts of collagen resembling keloid (A, B original magnification ×100). On immunohistochemical staining, the spindle cells were positive for muscle-specific actin (MSA) (C, original magnification ×400) and smooth muscle actin (SMA) (D, original magnification ×400).