On low power the lesion is composed of spindled cells in the dermis with a well defined Grenz zone; H&E stain, moderate magnification 40. On high power, bundles of interlacing spindle cells in the dermis. H&E stain, magnification 100. Same area of lesion as in (b) stained for Factor XIIIa, showing diffuse staining with scattered strongly positive cells; Factor XIIIa stain, magnification 100. High powered section of specimen showing cholesterol clefting and scattered giant cells; H&E stain, magnification 100
