Intravascular papillary endothelial hyperplasia – low magnification

Also known as Masson’s tumor or pseudoangiosarcoma
Typically occurs within a vein or a pre-existing vascular structure
Characterized by multiple papillary projections within the lumen of the vessel
Often associated with thrombosis
Intravascular papillary endothelial hyperplasia – high magnification
LEGEND
The vessels are composed of a single layer of endothelial cells without atypia.