Fig. 1

The anastomosis of cavernous region [3] and illustration of ICA-cavernous fistula. a Branches of cavernous segment of Internal carotid artery (1. meningopituitary trunk arter,including: ①inferior hypophyseal artery, ②dorsal meningeal artery, ③tentorial artery; 2. inferior cavernous sinus artery; 3. capsular arteries; 4. Internal carotid artery; 5. Ophthalmic artery;6. pituitary); b Cavernous sinus (internal basal surface of skull; including: 1. Superior ophthalmic vein, 2. Anterior intercavernous sinus; 3. pituitary; 4. Cavernous sinus; 5. Posterior intercavernous sinus; 6. Plexus basilaris; 7. Inferior petrosal sinus; 8. Glossopharyngeal nerve; 9. Vagus nerve; 10. accessory; 11. Hypoglossal nerve; 12. tentoriumcerebelli; 13. Sphenoparietal sinus; 14. Optic nerve; l5. Internal carotid artery; 16. Posterior clinoid process; 17. Oculomotor nerve; 18. Trochlear nerve; 19. Trigeminal nerve; 20. Abducent nerve; 21. Superior petrosal sinus; 22. Facial nerve 、acoustic nerve; 23. sigmoid sinus; 24. great cerebral vein; 25. sinus rectus); c Cavernous sinus (coronal section; 1. pituitary; 2. Internal carotid artery; 3. Aducent nerve; 4. Sphenoid sinus; 5. Sphenoid bone; 6. Oculomotor nerv; 7. Trochlear nerve; 8. Ophthalmic branch of trigeminal nerve); d Topography of cavernous sinus (relationship between ICA and cerebral nerve; 1. Superior wall of cavernous sinus; 2. Oculomotor nerve; 3. Trochlear nerve; 4. Aducent nerve; 5. ophthalmic branch of trigeminal nerve; 6. Trigeminal semilunar ganglion; 7. Mandibular branch of trigeminal nerve; 8. Internal carotid artery; 9. Ophthalmic artery; 10. optic nerve; 11. Superior optical fissure; 12. Maxillary branch of tigeminal nerve; e Carotid-cavernous fistula (1. ICA;2. Fistulous orifice;3. Cavernous sinus)