What Are Combined Vascular Malformations?
A combined vascular malformation involves two or more types of blood and / or lymphatic vessel abnormalities. Any of the four types of vessels (capillary, venous, lymphatic, or arteriovenous) may be combined. Combined malformations are often located on the arms or legs, but can involve any area of the body. The abnormal vessels develop early in pregnancy. They are thought to be caused by incorrect formation of the circulatory system (blood vessels and lymphatic channels) in a particular area of the body. Most combined vascular malformations are not inherited.