A 65 year old man presented with a left upper lip mass. Hematoxylin-eosin stains demonstrated proliferation of small, capillary sized vessels lined by plump, epithelioid endothelial cells. Numerous stromal eosinophils, plasma cells and lymphocytes were also seen. Immunohistochemical stains for CD31 and ERG were positive in epithelioid endothelial cells. SMA stain highlighted the preserved myopericytic layer around vessels. Which of the following is most likely the correct diagnosis?
