And, it can expose ipsilateral tractus opticus, internal carotid artery, posterior communicating artery
, anterior choroidal artery, thalamus arteriae perforantes, posterior cerebral artery, and pituitary stalk.
The following table and pie diagram show the Presence and Absence of Posterior Communicating Artery
The P2 segment of the PCA has in its junction the origin of posterior communicating artery
(PComA), with a mean length of 19.9 mm.
In almost all reported series of aSDH caused by aneurysm, the most common aneurysm arises in the posterior communicating artery
followed by the MCA.
Posterior communicating artery
is its most important component which connects vertebro-basilar and carotid arterial system.
[7-13] On the other hand, on the basis of clinical tests carried out in patients with occlusion of the internal carotid artery and occlusion of the basilar artery, it was concluded that the increased risk of stroke exist in patients whose posterior communicating artery
diameter was < 0.5 mm and these arteries should be considered as hypoplastic blood vessels.
Twenty-five percent of these are located at the origin of the posterior communicating artery
on the internal carotid artery .
Available data from the trial also suggest that even very small (less than 7 ram) aneurysms have a potential for hemorrhage that is "noteworthy and certainly far from zero" if they are located in the posterior communicating artery
or posterior circulation.
n % Supraclinoid ICA 7 10.3 ACA 1 1.5 ACOM 25 36.8 MCA 4 5.9 Paraclinoid ICA 2 2.9 PICA 2 2.9 PCOM 12 17.6 PCA 2 2.9 Vertebral 2 2.9 Basilar 10 14.7 Superior cerebellar 1 1.5 Total 68 100.0 ICA = internal carotid artery; ACA=anterior cerebral artery; ACOM = anterior communicating artery; MCA = middle cerebral artery; PICA=posterior inferior cerebellar artery; PCOM = posterior communicating artery
; PCA = posterior communicating artery