van der Hoeven et al reported the Posterior Circulation Collateral Score (PC-CS) to describe the collateral circulation in posterior circulation of the brain as seen on angiography. The authors are from multiple institutions in the Netherlands and Germany and belong to the BASICS Registry.
Exclusion: The score is not calculated if there are fetal variants of the posterior cerebral arteries (PCA arising from ACA; absence of P1 segments).
Arteries scored:
(1) left PICA (posterior inferior cerebellar artery)
(2) right PICA
(3) left AICA (anterior inferior cerebellar artery)
(4) right AICA
(5) left SCA (superior cerebellar artery)
(6) right SCA
(7) left PCoA (posterior communicating artery)
(8) right PCoA
Parameter
Finding
Points
left PICA
patent
1
not patent
0
right PICA
patent
1
not patent
0
left AICA
patent
1
not patent
0
right AICA
patent
1
not patent
0
left SCA
patent
1
not patent
0
right SCA
patent
1
not patent
0
left PCoA
patent with diameter >= ipsilateral P1
2
patent with diameter < ipsilateral PI
1
not patent
0
right PCoA
patent with diameter >= ipsilateral P1
2
patent with diameter < ipsilateral PI
1
not patent
0
total score =
= SUM(points for all of the scored segments)
Interpretation:
• minimum score: 0
• maximum score: 10
Total Score
Posterior Collateral Circulation
0 to 3
poor
4 or 5
intermediate
6 to 10
good
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