What is the difference between an avm and an aureysm?

AVM vs Aneurysm: An aneurysm is a blister of a blood vessel, usually at a point of branching. These have a propensity to rupture and cause bleeding as they grow in size. An avm is a malformation or tangle of blood vessels, usually with thin walls that have the potential of having catestrophic bleeding.

Anatomic: An avm or ateriovenous malformation occurs when there is a direct communication between an artery and vien. An aneurysm is a weakening in the wall of an artery which can cause it to enlarge. Avm's can be secondary to trauma, hereditary, and other causes. Aneurysms can be caused by trauma, athrosclerosis, infection, or hereditary. The anatomic location is important.