Fig. 3
From: Retiform hemangioendothelioma: a case series and review of the literature
Angiosarcoma: a A cellular spindle cell tumor arranged in fascicles with vascular channels at periphery. b These cells show moderate cytologic atypia. Kaposi sarcoma: c Low power shows dermal proliferation of vessels and spindle cells. d Endothelial cells show mild atypia, cytoplasmic vacuoles and extravasated red blood cells. These cells are positive for ERG immunostain (inset). Papillary intralymphatic angioendothelioma (Dabska tumor): e Lesion composed of variable sized intraluminal proliferation of papillary tufts. f These tufts have hyaline cores. The lining cells have uniform round nuclei