Internal carotid artery hypoplasia presenting as anterior ischemic optic neuropathy

Optic Neuropathy Mimicking Normal Tension Glaucoma Associated with Internal Carotid Artery Hypoplasia

“…It is our belief that this collateral pathway provided indispensable circulation. Hypoplasia of the ICA is rare : less than 100 cases having been reported (Horowitz et al, 2001). Although this condition rarely occurs, the possibility that hypoplasia of the ICA could be the associated with an ischemic ocular syndrome that mimics NTG needs to be taken into consideration when diagnosing such patients.…”

“…Horowitz et el. previously reported an uncommon case of anterior ischemic optic neuropathy that was associated with hypoplasia of the interanal carotid aretry (ICA) (Horowitz et al, 2001) . Here, we report on a curious case in which clinical expression mimicked NTG, but upon further examination there was considered have been an ischemic event due to ICA hypoplasia that was responsible for the noted visual field change.…”

Rubeosis Iridis Resulting from Agenesis of the Internal Carotid Artery: A Case Report~!2008-10-14~!2008-11-28~!2008-12-05~!

“…However, the new vessels are threatened by rupture with subarachnoid or meningeal hemorrhage and by ischemia [3]. Only one case, anterior ischemic optic neuropathy, has been reported as an ocular symptom of ICA agenesis [4]. …”

Analyses of the relation between internal carotid artery siphon and non-arteritic anterior ischaemic optic neuropathy

“…Another study suggested that patients with NAION showed markedly different retrobulbar haemodynamics with reduced circulation velocity in the ophthalmic artery measured by colour Doppler imaging (CDI) [9]. As we have known, previous studies discovered a link between the pathogenesis of NAION and the intima-media thickness (IMT) of carotid arteries and carotid diseases [9,10], but in our knowledge, there were few researches on the association of NAION and the diameter of ICAS so far. In fact, ICAS is a very special area from the anatomical point of view in patients with NAION [11], the narrowing of the vessel here might affect the lower reaches' hemodynamics directly.…”