<unk>  is an abnormal connection between arteries and veins, bypassing the capillary system. This vascular anomaly is widely known because of its occurrence in the central nervous system (usually cerebral<unk> , but can appear in any location. Although many<unk> s are asymptomatic, they can cause intense pain or bleeding or lead to other serious medical problems.<unk> s are usually congenital and belong to the RASopathies. The genetic transmission patterns of<unk> s are incomplete, but there are known genetic mutations (for instance in the epithelial line, tumor suppressor PTEN gene) which can lead to an increased occurrence throughout the body.
Arteriovenous malformation
Cavernous venous malformation
Cerebral arteriovenous malformation
Vein of Galen aneurysmal malformations
Vascular malformation
Aneurysm
Cirsoid aneurysm
Chiari malformation