A vascular malformation is a type of birthmark, or congenital
(present at birth) growth, made up of arteries, veins, capillaries, or
lymphatic vessels. There are several different types of malformations
and they are named according to which type of blood vessel is
predominantly affected. A vascular malformation is also known as an arteriovenous
malformation and vascular gigantism.
Vascular malformations are present at birth and enlarge
proportionately with the growth of the child. They do not involute
spontaneously and may become more apparent as the child grows.