Ophthalmic artery aneurysm
Those that arise from the superomedial aspect of the internal carotid artery just distal to the ophthalmic artery origin and projects superiorly or dorsomedially towards the lateral portion of the optic nerve.
Ophthalmic segment aneurysms (OSAs) OSAs include (NB: nomenclature varies among authors):
a) Paraclinoid internal carotid artery aneurysm: usually does not produce visual symptoms
b) suprasellar variant: when giant, may mimic pituitary tumor on CT.