“…4 Histologically, the cysts often demonstrate an attenuated endothelial lining, highlighted by CD31, CD34, and ERG. 1,4,[10][11][12] The pathogenesis of vascular cysts is unclear and has been suggested to arise either from a preexisting vascular hamartoma or ectasia of lymphatic channels or secondary to intraparenchymal hemorrhage. 2,4,10,13 Vascular cysts have been noted to contain some component of PEH, but rarely is it the primary finding.…”