Fig. 1

Patient who was excluded because of the absence of an ophthalmic artery on preprocedural DCECT. (a) Ophthalmic artery is seen on the left side orbital apex (black arrow). The right ophthalmic artery could not be recognized in the arterial phase of DCECT. (b) Instead of that, a tortuous artery (black arrow) running through the superior orbital fissure could be seen. (c1, c2) The early and delayed phase of external carotid angiogram. The ophthalmic artery connecting from the middle meningeal artery and choroidal crescent could be seen in the delayed phase. (c3) There was no ophthalmic artery on the internal carotid angiogram