4 anatomic segments of the PCA:
- P1 segment: from tip of basilar to origin of PComm
- P2 segment: from Pcomm to dorsal midbrain
- P2A – anterior segment
- P2P – posterior segment
- P3 segment: from lateral quad cistern at origin of post temporal artery to ant limit of calcarine fissure
- P4 segment: terminal cortical branches of PCA after takeoff of parieto-occipital and calcarine arteries
AJNR Am J Neuroradiol. 2001 Jan;22(1):27-34. “Aneurysms of the posterior cerebral artery: classification and endovascular treatment.” Ciceri EF1, Klucznik RP, Grossman RG, Rose JE, Mawad ME.