“…Immunohistochemically, the cells lining the cavernous space and vacuolated epithelioid cells are positive for vimentin, CD31, CD34, and factor-VIII-related antigen, supporting the endothelial nature [ 1 – 3 , 5 , 7 – 9 , 11 , 12 , 15 ]. Weiss and Enzinger [ 13 ], Tosios et al [ 1 ], Ide et al [ 5 ], and Cai et al [ 9 ] reported that the lining cells and vacuolated epithelioid cells are positive for vimentin, CD31, CD34, and factor VIII, and in contrast, spindle cells are negative for endothelial markers.…”