Vasculitis Center (Johns Hopkins Medicine)

“Vasculitis” is a general term for a group of diseases that involve inflammation in blood vessels. Blood vessels of all sizes may be affected, from the largest vessel in the body (the aorta) to the smallest blood vessels in the skin (capillaries). The size of blood vessel affected varies according to the specific type of vasculitis.

http://www.hopkinsvasculitis.org/