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Dangerous extracranial-intracranial anastomoses and supply to the cranial nerves: vessels the neurointerventionalist needs to know Geibprasert S; Pongpech S; Armstrong D; Krings TAJNR Am J Neuroradiol 2009[Sep]; 30 (8): 1459-68Transarterial embolization in the external carotid artery (ECA) territory has a major role in the endovascular management of epistaxis, skull base tumors, and dural arteriovenous fistulas. Knowledge of the potential anastomotic routes, identification of the cranial nerve supply from the ECA, and the proper choice of embolic material are crucial to help the interventionalist avoid neurologic complications during the procedure. Three regions along the skull base constitute potential anastomotic routes between the extracranial and intracranial arteries: the orbital, the petrocavernous, and the upper cervical regions. Branches of the internal maxillary artery have anastomoses with the ophthalmic artery and petrocavernous internal carotid artery (ICA), whereas the branches of the ascending pharyngeal artery are connected to the petrocavernous ICA. Branches of both the ascending pharyngeal artery and the occipital artery have anastomoses with the vertebral artery. To avoid cranial nerve palsy, one must have knowledge of the supply to the lower cranial nerves: The petrous branch of the middle meningeal artery and the stylomastoid branch of the posterior auricular artery form the facial arcade as the major supply to the facial nerve, and the neuromeningeal trunk of the ascending pharyngeal artery supplies the lower cranial nerves (CN IX-XII).|Arteriovenous Fistula/*diagnostic imaging/*therapy[MESH]|Cranial Nerve Diseases/etiology/*prevention & control[MESH]|Cranial Nerves/blood supply/diagnostic imaging[MESH]|Embolization, Therapeutic/adverse effects/*methods[MESH]|Humans[MESH]|Intracranial Arteriovenous Malformations/*diagnostic imaging/*therapy[MESH]|Models, Anatomic[MESH]|Neuroradiography/methods[MESH]|Radiography, Interventional/*methods[MESH] |
