Responsible blood vessel | Frequency | Etiology | Mainly Population | Haemodynamics | Progress | |
---|---|---|---|---|---|---|
Type A | shunt between the ICA and cavernous sinus | More than 70% | associated with trauma | young male | high-flow CCFs | acute |
Type B | shunt between the meningeal branches of the ICA and cavernous sinus | Less than 30% | Spontaneous | older female | low-flow CCFS | chronic or relapsing |
Type C | shunt between the meningeal branches of the external carotid artery and cavernous sinus | |||||
Type D | shunt between the meningeal branches of the ICA, external carotid artery, and cavernous sinus |