Low magnification shows a noncircumscribed lesion in the dermis and subcutis composed of an admixture of thin-walled dilated blood vessels and sheets of spindle cells.
Low magnification of a spindle cell hemangioma shows a well-circumscribed intravascular tumor with ectatic vascular spaces
and a cellular spindle cell proliferation. There is a remnant of a preexisting vessel at the periphery 
.
High magnification of spindle cell hemangioma shows straight/curved fascicles of uniform spindle cells
with irregularly shaped vascular spaces 
and small areas of hemorrhage.
High magnification shows the spindled tumor cells and the characteristic vacuolated endothelial cells (so-called blister cells).
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