Certainly, they may be. How fatal or serious an arteriovenous malformation might be relies on its measurement and placement. A huge bleed from the ruptured AVM within your brain could be lethal. Nevertheless, some individuals have AVMs and in no way have any indications or medical problems. Transcranial Doppler ultrasound. https://www.sgvascularctr.com/understanding-venous-malformation-treatments-in-singapore/