In the angiography a notch can often be observed in the anterior superior medial aspect of [[giant ophthalmic artery aneurysm]] due to the optic nerve
((Heros RC, Nelson PB, Ojemann RG, Crowell RM, DeBrun G. Large and giant
paraclinoid aneurysms: surgical techniques, complications, and results.
Neurosurgery. 1983 Feb;12(2):153-63. PubMed PMID: 6835497.
)).

Try oblique 25º away from injection side, center beam 3-4 cm above lateral aspect of ipsilateral orbital rim, orient x-ray tube in [[Towne’s view]]. Try submentovertex view.