Posterior communicating artery aneurysm classification

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(Anteroinferior)-Projecting (Unruptured) (Saccular) (Wide necked) (Giant) posterior communicating artery aneurysm.

see Intracranial aneurysm classification.

1. May occur at either end of Posterior communicating artery that is at the junction with the PCA, or more commonly at the junction with internal carotid artery (typically points laterally, posteriorly, and inferiorly). May impinge on the third cranial nerve in either case and cause oculomotor nerve palsy (ptosis, mydriasis, “down and out” deviation) that, is not pupil sparing in 99% of cases.

2. Posterior communicating artery aneurysms associated with a fetal posterior communicating artery.Fetal-type posterior communicating aneurysm

3. True posterior communicating artery aneurysm.

4. Ruptured posterior communicating artery aneurysm.

Wide-Necked Posterior Communicating Artery Aneurysm