A new study has found that blood vessels in the retina may hold early clues about a person’s risk of developing dementia.

Arteriole-venule shunts are small muscular valves that connect directly between an arteriole and a venule to bypass the capillaries. Arrows indicate the direction of blood flow.

The inflammation affects the smaller vessels of the skin such as the capillaries and the medium-size vessels that include venules and arterioles. Small vessel vasculitis is the most common cause ...