localized, pathological, blood-filled dilatation of a blood vessel caused by a disease or weakening of the vessel's wall.
a widening (dilation) of a blood vessel
Small blister-like outpouchings of blood vessel walls. They can rupture, causing bleeding.
A balloon-like swelling in the wall of an artery.
Weakening of a blood vessel wall by inflammation. Sometimes leads to rupture of the vessel.