Most commonly caused by hypertension, continued stress on the walls of the artery will degrade the vessel wall by damaging and loosening the collagen and elastin meshwork which comprises the intima. Similarly, hypercholesterolemia or hyperlipidemia can also provide sufficient trauma to the vessel wall resulting in<unk>  As the arrangement of connective tissue is disturbed, the vessel wall is no longer able to hold its original conformation and begins to unravel due to the continued hypertension. High blood pressure mold and force the artery to now take on an elongated, tortuous course to better withstand the higher pressures.
Intracranial dolichoectasias
Vein of Galen aneurysmal malformations
Chiari malformation
Porencephaly
Periventricular leukomalacia
Hydrocephalus
Cavernous venous malformation
Intraventricular hemorrhage