What is epithelioid hemangioendothelioma? Epithelioid hemangioendothelioma, or EHE, is a very rare tumor that develops from endothelial cells lining the inside of blood vessels. Find our full video library only on Osmosis: http://osms.it/more. Join millions of current and future clinicians who learn by Osmosis, along with hundreds of universities around the world who partner with Osmosis from