Khan Academy on a Stick
What is vasculitis?
Vasculitis is a group of medical conditions which cause damage to the blood vessels through inflammation. Depending on which blood vessels are affected, vasculitis can be classified as large vessel, medium vessel, or small vessel vasculitis. Learn about the signs and symptoms of vasculitis such as purpura, bloody stool and urine, and bruits.
If the above player doesn't work, try this direct link.