**1.1 Definition**

Cerebral arteriovenous malformations (cAVMs) are the vascular abnormality composed of a complex, tangled web of afferent arteries and draining veins linked by an abnormal dysplastic intervening capillary bed or no capillary bed (**Figure 1**). The raptured cAVM is a neurosurgical emergency requiring team management approach including neurosurgeons, neuro-interventional radiologist, neuroanaesthesiologist and an intensivist.

**Figure 1.** *Cerebral arteriovenous malformation.*
