A cerebral arteriovenous malformation refers to a vascular malformation between arteries and veins of the brain forming what is called a “nidus”, in which the pressure is abnormally high causing a risk of bleeding by rupture of the vascular wall estimated between 1 and 5 % per year.

These may be more or less large malformations associated with variable venous drainage.

Likewise, their location can be deep or shallower in the brain and all of these criteria allow us to classify them and assess the therapeutic risk.