Endothelium lines the interior wall on the vessel Vascular ailment is really a pathological condition of large and medium muscular arteries which is activated by endothelial mobile dysfunction.[22] Primary lymphedema (unusual): Lots of people are born without particular lymph vessels or have abnormalities in them. Capillaries. They're very small blood vessels https://www.sgvascularctr.com/a-comprehensive-approach-to-lymphoedema-treatment-a-vascular-surgeons-perspective/